Disgusted with telkom

My two year contract expired with telkom in September 2020, Account number ***.I informed them via the telkom online portal that I would be cancelling my service with telkom as of 30 November 2020 To date my service was not Cancelled and I have been billed ongoing. The outstanding amount is over three thousand rand, and iam not in a position to pay this debt. To boot I have a telkom mobile contract as well, my Sim card went faulty and I can no longer use it. I approached telkom for a Sim swop at which time they informed me that I was in arrears with my account and untill that account is settled they will not give me a new Sim card so I'm paying for a service I can't use. Please assist me where possible Many thanks

Gavin Bridge