Incompetant consultants

I repeatedly requested cell c consultants to cancel my debit order so I can make EFT because my account is debited on different dates by cell c which really mess up my bank account which result in me paying unnecesary bank fees. I always paid my account on the 26th of every month over the past year. It is now about 4 months I have to pay failed debit fee of R 70.00 even while my account was paid. Last month I paid R45.00 extra because I forgot I cancelled my data contract. Now my accoubnt is deactivated because I owe cell C R90.00 which no one can explain how come I owe R90.00 while failed debit is R70.00 considering my account was already paid extra. I want cell c to know I will not be paying that R90.00 since I was assured that this failed debit thing will never happen again the last time I paid the R70.00. Can they also confirm that my *** and *** contracts are cancelled for end of May? The remaining contract will also be cancelled at the end of the term. I called customer services so manty times requesting the same thing and it seems nothing is ever recorded. I am being ********** every month the very last cent I have by Cell C