sick and tired of vodacom bad service

Can someone from Vodacom who knows their job call me because I'm sick and tired of speaking to different people and telling different stories, my debit order with Vodacom goes off on the 20th of each and every month and on the 20th of September they didn't deduct the money they tried to deduct it on the 25th of which there was no funds on the account ,when I called to find out what went wrong they told me that from the 18th of September until last day of the month they were experiencing a system problem is not my fault that they have a system problem now they are charging me extra R100 for a debit order that bounce on my account ,I actually need my R138 for the unpaid debit order that was charged on my account ,and on top of that I keep on receiving phone calls from them about the extra R100 that I need to pay ,I need answer as soon as possible because what you are doing is wrong making extra money out of people