Pathetic service

Good day need some urgent assistance We had 4 contracts with Cell C we wanted to settle the accounts so asked for a settlement letter on all the accounts with them with a long struggle and a hole lot of phone conversations and emails I received an amount I paid the amount and send them the proof of payment received a mail saying my accounts will be cancelled by 30 July .I do not receive my monthly allowance from them any more but they still debit my account each month I have phoned them numours time to sort it out and get it reversed but no luck at all I have all the prove still on email and they obviously on there phone records