Customers charged for Cell C's stupid systems that does not debit if your debit date falls on a Sunday (We customers became calendars now we should choice debit dates that does not fall on Sundays ever)

Ok so I've been a Cell C customer for +-20 years and time and time again I've been disappointed with the service I receive, I really think this is now the last straw, I have a contract which debits every 21st and because the 21st of August fell on a Sunday Cell c did not debit my account and on that same Sunday they sent me a sms stating my debit did not go through and to make payment the following Monday 22nd August between 7h30 and 8hooam I called customer care to enquire about the sms I received and the consultant told me that what she is seeing on her side the account looks fine and that it does not show that the debit did not go through, in any case the consultant said to pay the amount manually as it will only show after 3 days on there side that the payment did not go through so while on the line with the consultant I made the EFT to Cell C immediate payment and advised the consultant to make the note that I'm paying the amount manually, the same day around 4 or 5pm a consultant called to tell me that they did not receive any payment, then I explained to that consultant that I have made payment that very morning and to check her notes where she stated that no notes have been made, then again I told her to please make a note as the EFT was already done. To my surprise the 23rd August another consultant called and told me the same thing about the account not being paid, as I was now so frustrated I scream at the consultant and asked but how does this company work are you all working on independent systems that the one consultant cant see what the other consultants are updating on the notes consultant apologized and I told him I do not want another call from someone else in that department asking me the same things over and over I have already made the payment, Then boom later that night which is now he 23rd August the debit order goes off my account, wow.... I went to my bank and reversed that amount as now Cell C will be paid double the EFT I made manually (22nd August) and 2days later the debit order that was suppose to go off in the first place. Now 21st September Cell C decided to debit my account on time but penalizing ME R70 for late payment of the previous month imagine as if it was my fault that the 21st fell on a Sunday and they did not debit my account when they were suppose to, so again I called the customer service spoke to the manager Cynthia where she told me that they can not / will not reverse the penalty as the debit did not run on the 21st because it was a Sunday therefore I am liable to pay the penalty, Could someone please assist in some advice as to what to do now because the same manager told me they do not have an Ombudsman and no one higher then her to complain to #madashell #paybackmymoney