Agreed on the scam. The way to handle this is to not pay, and send a letter claiming that you don't owe it. If they send it to collections you can sue for collecting a debt not owed. If a collector contacts you about debts they know or should have known are disputed then you can also collect statutory damages from those people. If they report to credit rating agencies, and you dispute the facts with them and they take more than a month to resolve the issue you can also sue those agencies, and you have fresh grounds for suing the debt collector as well. You may be awarded treble damages!

This is an amusing pastime if you can afford temporary depressions in your credit score.