Handed Over Twice for same account

Hi,<br> <br> I had an account 6 years ago with car track and i paid it off, now after so many years i am request for proof of payment for something i paid MANY years ago, 1. i don't have that proof of payment anymore, 2, i don't know why i am handed over as if i didn't pay, 3. Cartrack CallCentre tells me they cant do anything for me and the company handling the account cant help me. i know for a fact that when my account was closed i sent proof of payments to some Senior people at Car track but i don't have the names any more.<br> <br> Please help me resolve this so can all continue with our lives.