Cell C does not care abou customer service

I cancelled my data contract with cell c on the 3rd of Feb this year... I was told by Zea that I would only need to pay for 5 days at the end of March... I have since then sent numerous emails and spoken to numerous people from cell c after which I was told that there are extra monies to be paid by me... I stated more than once that this was not what I was told. I advised cell c not to deduct any monies from my account seeing that this matter was pending, they have tried to do just that... rendering my account into a negative and costing me R115.00 for a returned debit... I feel that cell c's service has dropped extremely and this is not the first complaint I have with them... this is ridiculous...