Penalty, Bad service, Debit order date

I have a bad experience with Vodacom!!!! I have been with Vodacom for the past 9 years. I apply for a Vodacom contract a year ago at Makro and the debit order date on Vodacom side is the 26 and sometimes it goes of on the 29. When there where not enough funds in my bank account I got a penalty of R100. According to my contract my debit order date is the 01 of every month. I would understand if the penalty was R20 but a R100????? The bank charges was not even that much when the debit order bounce back. Now I have to go to Makro because they have the wrong date... Doesnt the contract that I sign go through to Vodacom?? When I called Vodacom I had a consultant screaming and being rude at me so I lost it! In the beginning of the year we also apply for another contract with Vodacom and receive also a **** service! I will never upgrade or apply again at Vodacom.