Collections Notice with No Information

 I have been receiving collections notices from a company called Debt Collections Agency (DCA) for a Telus Wireline account that I don't recall ever having.  They are threatening to contact me at my place of employment if I don't pay the outstanding balance.  I researched this situation online, and found that there are a number of scam reports about this company doing the very same thing to other customers.  When I contacted Telus customer service, the representative told me that according to his files, he showed that I do have an outstanding balance for a Telus Wireline account, but could give me no information about it, and indicated the name of a completely different collections agency (General Credit Services) that was managing the collection.  I have attempted to reach out to GCA as well to get information, as this all seems very suspicious.  I find it unacceptable that I received no notice from Telus that I had an outstanding amount owed, and the first I hear about this account that I didn't know that I had is coming from a collections agency.