The utility provider sent my final bill to my old address, so I?
Certainly you knew that you had an unpaid utility bill. Each month you receive a bill for the electricity ,etc you have used. When you moved, you knew that there was a bill that you hadnt paid. When a rational and responsible person moves to anew address that person notifies the postal service so that their mail is forwarded. You know what companies you have business with, call each and ask them if you have a debt outstanding.