i want my money back and your contract cancelled again and remove my details on your sytem

i had a contract with cell c few years back and alst year i pad it up and called them and asked them to cancel my contract ,i thought that was done only to find that for a year now cell c has been deducting R75.00 from my account without my concern or approval cause i know i have cancelled my contract with them last year as if that was not enough enough they consultants are just so whack they didn't resolve my issue ,why would they take people money and give them contract they didn't sign for i want answers and my money back