Transworld Systems Canada Inc. mailing address
To mail a letter to Transworld Systems Canada Inc. (TSI, TSICO, formerly EOS Canada Inc.), send it to Transworld Systems Canada Inc., Suite 1111, 11th Floor, 325 Milner Avenue, Scarborough, ON M1B 5N1. Transworld Systems Canada Inc. (TSI, also known as TSICO) is a third-party collection agency with offices in Toronto and Montréal. It was formerly known as EOS Canada Inc. before Transworld Systems Inc. acquired and rebranded it in 2022. This address is for written correspondence — most commonly a debt-validation/dispute request or a letter asking to be contacted only in writing. Include your account or reference number and keep a copy of what you send, and confirm the address on the company's own site or your most recent letter from them before anything time-sensitive.
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Mailing address
Verified September 2026Transworld Systems Canada Inc. — correspondence address
Transworld Systems Canada Inc. Suite 1111, 11th Floor 325 Milner Avenue Scarborough ON M1B 5N1
Written debt-validation/dispute requests and cease-contact letters. This is the company’s correspondence address, not necessarily the PO box printed on a payment coupon.
No printer, envelope, or stamp — we print and mail it the next business day.
Sources
Addresses verified September 2026 against official sources. Always confirm on the official site before time-sensitive filings.
Key facts
- This is TSI's published correspondence address, verified against its own site or an independent business register.
- Transworld Systems Canada Inc. (TSI, also known as TSICO) is a third-party collection agency with offices in Toronto and Montréal. It was formerly known as EOS Canada Inc. before Transworld Systems Inc. acquired and rebranded it in 2022.
- Most provinces require a collection agency to send you a written notice with details of the debt before or shortly after first contacting you, and to provide verification if you dispute it in writing.
- Provincial rules (like Ontario’s Collection and Debt Settlement Services Act) also let you send a written request limiting a collector to contacting you only in writing, or through your lawyer.
- Use a trackable mail service and keep a copy — the date you sent a letter can matter for your rights.
- PostPal prints your letter and mails it for you — no printer, envelope, stamps, or post office trip.
How to send your letter
- 1
Decide what your letter is for
Common reasons to write to TSI: requesting written validation/verification of a debt you don’t recognize or dispute, or asking in writing that they contact you only by mail. Say clearly which one this is.
- 2
Include the details they need
Include your full name, the account or reference number from their letter (if you have one), and your current address. If you’re disputing the debt, say specifically what you’re disputing.
- 3
Address it to the correspondence office
First line: Transworld Systems Canada Inc.. Next: Suite 1111, 11th Floor. Then the street: 325 Milner Avenue. Then: Scarborough ON M1B 5N1.
- 4
Send it — ideally trackable — and keep a copy
Consider certified mail / a tracked service and keep a copy of the letter and proof of mailing, since the date you sent it can matter for your rights under the applicable law.
- 5
Send it with PostPal
Write or upload your letter to PostPal with the address above prefilled. We print it, add your return address, and mail it for you — no printer, envelope, stamps, or trip to the post office.
Common questions
What is Transworld Systems Canada Inc.?
Transworld Systems Canada Inc. (TSI, also known as TSICO) is a third-party collection agency with offices in Toronto and Montréal. It was formerly known as EOS Canada Inc. before Transworld Systems Inc. acquired and rebranded it in 2022. The address above is its correspondence address — where to mail a written validation/dispute request or a cease-contact letter, not a place to show up in person.
What is the Transworld Systems Canada Inc. mailing address?
Transworld Systems Canada Inc., Suite 1111, 11th Floor, 325 Milner Avenue, Scarborough, ON M1B 5N1. Confirm it on the company's own site or the letter they sent you before mailing anything time-sensitive, since collectors do relocate.
How do I ask TSI to verify or validate a debt?
Write a short letter stating you're requesting validation/verification of the debt referenced in their letter, including the account or reference number, and send it to the address above. Most provinces require a collection agency to send you a written notice with details of the debt before or shortly after first contacting you, and to provide verification if you dispute it in writing. Keep a copy and proof of mailing.
Can I tell TSI to stop contacting me by phone?
Provincial rules (like Ontario’s Collection and Debt Settlement Services Act) also let you send a written request limiting a collector to contacting you only in writing, or through your lawyer. Put your request in writing and send it to the address above so there’s a clear record of when you asked.
Does writing to TSI make the debt go away?
No — a validation request or cease-contact letter doesn't cancel a debt; it exercises your right to written confirmation and to control how you're contacted. If you believe the debt isn't yours or is inaccurate, say so specifically in your letter. For guidance on your rights, see your provincial consumer-protection ministry (e.g. Consumer Protection Ontario) or the Financial Consumer Agency of Canada.
How do I mail Transworld Systems Canada Inc. a letter without a printer?
Write or upload your letter to PostPal with the address prefilled. We print it, add your return address, and mail it for you — no printer, stamps, or post office trip needed.