KEEP TAKING MY MONEY, WHILE THEIR FAULT!

We have changed the debit order details on our account and still they keep taking the money from that account and if it does not go through, they charge me for penalties. We get gigantic bills of R3000 and we are only 2 people working all day and only at home in the evenings?? they do double debit orders on different accounts and won't pay back the cash money? Why can't you get your ****ty service in order, we pay taxes!!!!!