Bridge of Contract and poor service

My name is Xoliswa, I have signed up new contract with Vodacom in Jan 2018. The sales man did a wrong contract under my name and that contract was cancelled and corrected to the new account that belongs to me. Now Vodacom has debited my account a cancellation fee of R9028.69 of the wrong account including monthly payment of the new contract of R1081.01. I have made Vodacom aware of this, and nothing has been done since 24th Jan 2018. I have been again calling Vodacom to fix this matter till to date and nothing has been done. Vodacom has bridged their contract by over billing me on the wrong account that does not belong to me. Due to Vodacom over billing and debiting a huge amount of R10 301.01 my other debit orders has bounced and I'm being penalised for bounced debit orders. Vodacom should pay for these bank charges that I incurred because of the their over billing.