This is a collection service based in downtown Toronto, and they specialize on collecting from tenants who skip out on their leases.

Called 3 times, and I told them I had no information for them

Identity thieves. Total scam. Call for an unknown person, looking to engage you in conversation long enough to steal your identity. Never give your information over the phone. FYI. A real company will not call you for debts over 2 years old, it is the law in Ontario. These people just try to rip off the old, or immigrants. Best advice is to not pick up the phone.