Pathetic service from CELL C

Dont ever take out a contract with cell c I had contacts with them and they are all paid up but than I got handed over for what I have no idea.... I have proof of all my payments they hand you over to random companies that you have to keep sending the proof to and still they say you owe they have no idea of what is going on in their own company this is the 5th year that the damn collection agency has contacted me really it's frustrating now I'm taking it to the ombudsman I had enough!!!!!!!