Excessive charge

My gripe once again is with Vodacom. I am a pensioner where every cent counts. I pay my account every 25th of the month. This month being November the 25th fell on a Saturday. All my other debit order with Telkom etc. went out on Saturday. I called Vodacom to ask why they haven't taken the money on 25th. I was told they don't do weekends, fine. I also added its Monday 27th has the money being taken? I was told it was, and if not I would receive an sms to say insufficient funds. She also added they are backlogged. So I thought all is fine. I shopped using my card and that evenning I received a message from my bank "insufficient funds Voda" Later Vodacom sent a similar message. I was charged R7 by my bank and a R100.88 by Vodacom for late payment. Who? is in Cell, Communication and banking business? Vodacom merry Christmas for taking a bonus from me oops!! I mean admin cost. You are the bank. Can't wait for NY contract to end.