THEY ARE CHARGING ME FOR A CONTRACT THAT I CANCELLED!!!

Vodacom is so unbelievable!!! I had 2 contracts, after the 24 months, i renewed the one & cancelled the other. Surprise Surprise, they renewed both. I have called the numerous times to cancel the contract that I AM STILL PAYING FOR. They keep on saying that they are going to get back to me within 2 days but I have not received any response from them. I’m sick & tired of calling them to BEG them to cancel an account which was meant to be cancelled in the first place!!! I go into the store & they tell me to call... I do call and they tell me to wait 2 days. What else can I do?