Vodacom bad service and untrained consultants giving different advise

I paid my account in full and Vodacom in November. Vodacom resumed a cinteactvwithout my consent .I have been calling them since November to cancel the contract as I have now paid the arrears and dont want a contract with them.All the consultants do not provide accurate information all of them advise differently as to what is happening with the account.Now the account is owing for 2 months and they were debiting my account without my consent.They did not send me a debicheck to approve the debit order.This is not fair and I need answers from Vodacom as I cannot be blacklisted for something I did not consent to