Cancel my contract

Hello I need help with Vodacom. They keep on debiting for services I don’t need and I don’t use anymore, I called them months in advance and I also called them during the month when my contract was suppose to expire to tell them to cancel it…They told me my account is in arrears I should pay such amount and I did just to get information on what’s going with my account and why am I being debited while I kept on calling them to tell them to cancel my contract, they told me to wait a couple of hours for the money to reflect I kept on calling after hours they said I should wait 24th, 48hrs now it’s 72hrs just for me to get information on why am I in arrears while I called them and asked them to cancel my contract after paying which it was suppose to end in May yet keep on sending me messages to pay money for services I asked them to cancel. Where’s the honesty