Rain - Poor service - Payment flop - Failture to close account

My account was handed over to the collectors where we arrange payment plan after 4 payment of R150 into collectors account my account still reflect arreas. The collector (Easton beery) is saying they paid the rain but amongst all payment i see on rain only R150 was app**** to account. i have going back forth with your so called *** but no one is willing to help me. i send proof payment in form of bank statement and still no one is coming back with a positive answer. i regret paying you guys and i wish it was possible to reverse all money i paid to you. Lastly im not using your service but im still getting charged for what because im not using your sim