Vodacom wants to **** me

Why is vodacom making it difficult to process contract cancelation? I called the a month ago to cancel my contract, it was nkt processed. A week ago i spoke me to them again to process my contract, we agreed that they will debit my account last week, i was debited. A week later they still say my debit does not redlect on their side, this is bull****. Vodacom please just assist me to cancel my contract with you. I don't want to have contract with you anymore. I want to go to MTN!!