Cell C SUBCRIPTION TO BE CANCELLED IMMEDIATELY

I was approached by a cell c sales person in the store and he offered me R150.00 cell C air time ,which I refused.He insisted till I accepted.Then I told him not to temper with my account,and he promised that was never going to happen.I also told him that it must have nothing to do with my card/acc,he then said he only needs my card to activate the cell c line.later i realized the card was loose and there was no airtime,I then went back to the store on several days and the sales people were no where to be seen.I was then given a number to call call these cell c people,I have spoken to more than 10 consultants and were all promising to get back to me.Non of them did that until I received my Edgars statement with th Cell C subcription on it.I called them and Pauline told me that it will not happen at once,but I needed the cancelation done immediately.I then thaught i should let you know ,please may you help me to get this subcription cancelled.I do not need that air time ANYMORE/AT ALL.I have not received the air time and I do not want to receive it.Please kindly assist.