DISHONESTY AND ********** INTO A FALSELY NEW CONTRACT BY VODACOM

My cellphone contract started June 2020 only for the airtime R278.99. End of June 2022 the contract ended, but they deducted R419.00 27 July 2022. I went to Vodacom Westgate Mall to find out about this deduction, they said there is a new contract, I told them that I did not agree to any new contract. I went to the bank to reverse the deduction I phoned Vodacom to inform them that I went to Westgate (they informed me of a new contract that I don't know anything about it) and also told them that I went to the bank to reverse the payment. I informed them that I did not sign for a new contract and they should cancel it. They said in order for them to cancel I should pay R520.08, of which I don't know why I cant just pay this amount for nothing as the cost of living is very high. I have been sent from pillar to post trying to cancel this contract.