Double debited my account leaving me in arrears

MFC i am washing my hands off from your service. Not only did we confirm that the problem had been resolved in writing, but your *********** systems and staff, have double debited my account again, leaving my personal account in arrears and fees that I now have to pay for returned debit orders. So this is what I have to say, either, you refund me my full amount by the morning, and when you have your story in order I will make manual payments to your account as you are messing up my finances and my cfredit record. I am one the verge of handing you over to lawyers over this mess. Get your act together, and I will comply, right now I want all my money back, and this matter if not resolved wiill be handed over to the ombudsman, and my lawyers.