Taking incompetence to a new level

I took out a contract with Telkom Mobile but struggled to get connected. I cancelled the contract on the 7th day and returned the phone which was accepted by Telkom Mobile within the period specified in the contract. Telkom gave written acceptance that they accepted the phone in a good condition.<br> I am still being billed for the phone after one year. I have been handed over to Nudebt who also received all the documentation proving that the contract was cancelled and the phone returned. I am still receiving calls for Nudebt who wants me to pay the outstanding bill that I am not liable for.<br> I have been provided with 5 different case numbers from Telkom but the matter still has not been resolved.<br> The level of service received is pathetic and unacceptable. The operators are rude and ***********.<br> I have all the proof and documents to verify that I have done everything within the contract terms