Telkom Mobile does not cancel contract

An S5 phone was ****** on 17 Feb 2017. We phone and cancelled the phone and sim the same day. The next day we phoned again just to find out it was not suspended and spent 3 hours on the line doing this again . . . So we asked that the phone and sim be cancelled and the contract which has run out. 6 months later this number all of a sudden left our family whatsapp group. In December we once again asked that the contract be cancelled. Again last week. So we are paying a contract for a year and that do not cancel it. Do not use Telkom Mobile!!!!