Debit order Failure

Once again my debit order has gone off and they put the money back in my account, I spoke to a lady in the accounts department where she requested my bank statements that is personal and nothing to do with the payment going out and in again. I phoned on Monday nobody bothered to phone me in the accounts department I had to phone use my time to phone and find out what the hell is going on, I am so frustrated with Vodacom I can really not wait for my contract to expire I am definitely taking my business some where else. It is costing me a arm and a leg on the end of the day September the same thing happen, I am paying a lot of banking charges and that because of Vodacom errors all the time. and I refuse to pay any penalties that because of the errors of the accounts department.