CELL C

I have been a good client of Cell C, however I have kindly asked them to to stop my contract after it had expired and do not want to go over on a month to month. I have tried phoning them several times to be placed on hold that resulted in spending airtime from my Vodacom cell (My Cel C contract is a data sim in a router) this is now the 3rd month they are deducting money and I work away from the city which leaves me in a difficult position to visit a store, I am extremely disappointed and furious as this is a basic cancelation process.