Do not use MTN

MTN is a **** and eat people money. I had a two year account with them and it ended. When I went to the store Vincent in East London they say they don't do cancellation of contact while I took my contract from them. I'm not using the SIM card but they are busy accumulating the balance and destroying my credit score while I don't own them nothing and they don't want to cancel my contract. Two year has ended my balance should be at zero when I'm not using the SIM card.