Readers Discount Center- Central Billings 119 N Fairfax Ave. #627Los Angeles, California 90036-2110 Magazine rip-off Internet

A couple years ago I recieved a phone call telling me that I had won some magazines.  I told them that I did not want to receive any magazines.  Well the magazines started coming. I recieved  several different ones and then those would quit and I received a different set of magazines, which to this date they are still coming.

I recieved a call last week from Central Billing telling me that they were a debt collector.  I was told that I would be recieving a bill in the mail for $894.64 for magazines that I had ordered.   I was told that if I gave them a credit card they would lower the bill to 600.00 or so. I refused because I never order the magazines nor had I ever recieved a bill.  

I was told that if I did not pay within 30 days  a negative credit report would be submitted to a credit-reporting agency. The creditor listed was Readers Discount Center.  I never ordered these magazines and do not intend to pay for them.  I did not know where they were coming from.  I was told that I had given them a credit card number.  They gave me the last 4 numbers, but it did not mach any of my credit cards.  I am positive I never gave them any credit card.  what do I do now?