Telkom poor service, cancellation

My data contract has come to an end in November 2017. I went to the store where I subscribed to the contract to cancel the contract - that was on 07 October 2017. The store informed me that they cannot cancel the contract, somebody from Head office needs to phone me to cancel the contract. Needless to say, nobody called, 2 month later, the contract is still not cancelled, despite bank stop debit order, Telkom debits the contract amount from my account. Contact with Telkom is virtually impossible. They are *******! I will never have any contract with Telkom again.