Unauthorised deduction and extention of a contract

Dissapointment is an understament on Vodacom services and i need justice and my money. I have a contract that is suppossadly close to expire or have expired, but now I'm getting debit orders close to R2200, unathourised from Vodacom. Who gave you Vodacom the right to do that to my account. As a company you should check and note that the contract I had with you was even dormant as I have not been using the data for the past year or so due to your poor and horrible service. Your data vanishes in a week while I pay a lot of money. I do not need any contract with you nor am willing to extend my existing or expired contract with you. To this end, plase urgently contact me and ensure you refund all the monies you been deducting from my accounts.