Account handed over despute

I called Vodacom and was told that my account was handed over to legal dept. In may I called Vodacom to arrange a debit order of R507 and requested that the airtime be canceled how ever an amount of R6320, 52 was deducted and when I called that it was a settlement amount of the contract I reversed that payment with the bank, however the consultant cancelled and the debit order as well. I need to have this account disputed and Vodacom to send me the copy of the last invoice. on the 18th of Aug I called accounts dept and was referred to legal and legal referred me to retention.