Nightmare of impossible cancellations

I have been trying to cancel an expired cellphone contract with Telkom for the past three months. I’ve tried everything but they continue deducting money from my account. On top of that, their billing is always questionable, with extra amounts unaccounted for. With the other service providers, you can simply make a phone call to cancel a contract but not for the damn Telkom. It’s mission impossible to cancel an expired contract. I regret ever taking a contract with Telkom. To anyone reading this, DO NOT DO BUSINESS WITH TELKOM. JUST DO NOT DO IT!