Clueless Call Centre Agents

Vodacom call centre they don't know what they are doing, I have logged a dispute with them on the 26th July after they debited my money unauthorised on the 26th July. They debited 616 instead of 397 monthly debit, I reversed it same day and paid the cash at Vodacom Woodmead and forwarded my proof of payment. The account is saying I am in arrears for something that I have never in my life utelised. I have spoken to over 10 different agents everyday and none of they is giving my feedback. Iam sick and tired of them, after this I am cancelling their contract, I have never skipped payment from Feb 2017 to date. Somebody please give me feedbackkkkkkkkkkkkkkkkkk.