Payment still not allocated payment of three Months

Cell c have a very bad customer service from both their call center and branches I Called them to change my account in March for may debit but nothing happens I was doing follow up every week with them but no one contacted me June they debit from my new account I call them to ask u deduct for June can u make arrangements for the May one I was told the department will call me for arranging no one called month end they over charged me I called them I was told to reverse n pay n I was given account number after paying I send proof of payment but at my surprise I was told my payment cannot be found I must resend I did but still the same following months I paid again but still my payment cannot be found n no one is come back to me wen I phone am promised it will be allocated within two days still now nothing cell c is no longer a business for people but they ar pushing their own motive by taking our money in the name of ur money is not reflecting how so bcos account number is theirs