Difficulty in cancelling contracts

After 3 calls to 135 and 2 emails to customer service my request has not been resolved. Been trying to have my contract cancelled but retain the number on prepaid but for some reason MTN cannot action this. My wife has been trying to do the same.

Been a MTN contract customer since 1998 and the only reason I am cancelling is because of emigration... It is pathetic that no one can assist. Both my wife and myself were told that our calls will be returned....we are still waiting... We do not want to have to walk into a store to action this due to the Covid situation so these platforms should be available and effective.... But once again, "brilliant" service from from a large corporate...