Unreal service

I was contacted on the 7th of May to say I have an outstanding amount owed to FNB and I paid it on the 8th, I was then told this would be sorted out and account be back to normal. Since then I have emailed and gotten no response, I have called and spoken to them where they say they sent it through to FNB and yet FNB say no such payments were made. I received a paid up letter from the attorney and told to go into the bank, which proved to be a complete waste of my time as nothing they can do. I then emailed an Atoinette at the attorney only to get no response, I emailed info and no response. I was then contacted by FNB who said the attorneys have not paid them the money, now any money that goes into my bank is being deducted by FNB (meaning I pay for a loan twice) and all everyone keeps saying is its escalated. I am sick of this as I have kept to my side of the agreement and no one else has, I am going to be looking at what my options are as I have now had debit orders returned as I get paid weekly and I cant put money in account as when I do as I said they deduct it. I want a letter stating from either you of fnb to send to the people trying to debit my account and this resolved!!