Manipulating contracts

I am so upset and inconvenienced with Telkom I took mobile router contract in August 2023 even still today they still debit my bank account for contract that is finished. They call me everyday trying to persuade me to take new contract but I keep telling them I don't want to renew. Having contract with Telkom was the worst decision ever I had made. Their signal in most times is not available specially weekends worse now they are *****ing my money from the bank