Vodacom refusing to cancel ********** contract and debit order

Good day,

Am extremely unhappy with vodacom's lack of response to a ********** contract and continuing to debit my account. Last month vodacom debitted R1500 on my account and when I called they told me that I had upgraded in Jan at a store which I never had. I filled in an affidavit as requested by vodacom and emailed the documents required to cancell this transaction and reverse my debit order. They said it would take 5-7 working days which didnt happen and I sent emails to followup and I called with no change and I keep getting a pre recorded call from vodacom that I must pay my account. I called my bank to reverse it and they did but now vodacom keeps debiting my account and this time they debitted R2900.

Please reverse this contract that I never signed for.