Cell C is *********!!

I have been a Cell C customer for many many years. My debit order agreement ( "note agreement" which is between two parties) is the last day of the month. Cell C took put the debit order in for Dec 27th. This was returned as I only have money coming in on the last day of the month. My January account reflects a R70 debit order penalty! I queried this and was asked to send a stamped bank statement proving they took the debit order off on the 27th. I duly sent them my bank statement only to be told according to section 5.1 of my contact they are allowed to take their money that is owing. Cell C you are correct you may take youroney and I have never ever not paid but what you are not allowed to do is go into my bank account and take your money on another date and break our agreement without sending me a notification of your intention. I see you are going to take R70 plus my usual amt tomorrow off my account. I think cell C is very *********! I spoke to the gentleman at the printing shop and Cell C did this to him for 3 of his family members and now he has to pay R210 extra. Do this to a million people and cell c makes money.... Totally *********!!