Vodacam Cancellation - pls cancel my account i cannot afford it and dont want to be in debt

I had a data contract with Vodacom for 2 years which expired at the end of june. I have started the cancellation request process on 27th May - my first contact with the call center. However, they have not cancelled the contract to date - 28 August. I have been calling every month to check if the contract is cancelled. i have completed forms and emaild twice to them. They were providing me with data (which i don't want and cannot afford) and expecting me to pay for it. Then if i do not pay the account, they will list me. So today i call them to check if the contract is cancelled, an di am not going to receive new data on 1st, they tell me they cannot cancel as my account is in arrears. The debit order goes out on 2nd by then new data comes in on 1st and that's how they binding me to something i cannot afford and o not want. It's because of companies like this, people in our country are overcome with debt that they cannot afford.