Poor customer service, billing system and *********** staff.

I had a problem with a debit order which was going through on the 25th of every month. On the 25th of September debit order failed because salary date changed to the 1st monthly. I called in end september and requested that debit order be changef to the 1st monthly and requested debit order to be sent to cover amount due which was R107. i understand i pay in advance which means because i changed date if they want to charge me extra, it should be a protated amount. But they charging me full R107. And they say i should have paid on the 25th September, then again on the 1st of October. which doesnt make sense. Now i called yesterday the 12 inquiring about it and their so *********** consultant couldn't explain to me and she dropped the call in me. Today again i called asking the other consultant to change my payment back to the 25th to clear this confusions, she argued with me and dropped the call again.