Mtn debit order, do not setup one with them at all

Last month I had an issue with my debit order and like the fool I was I decided to try it out this month again. On the 20th the debit order was due to be taken and guess what, it wasn't. Called on the 25th and was advised that they would now re instate it to be deducted on the 28th,again no payment was taken. I called once AGAIN and was told I could not go back to paying cash as 3 debit orders needs to fail. So basically what you saying that I must incur charges with my bank for 3 months before I can go back to paying cash when your debit order syst is faulty. I have also escalated this onto the ombudsman and don't want your stupid reply from your agents starting that they will look into it and then receive no response thereafter. Please note that I will not accept this **** from your company as I keep calling and no one is able to properly assist me.