Worst service from the person working on my query.

I tried changing my debit order date on 29 Sept to be effective from October. I have been struggling till now JUST to change a debit order date as you requested signed letter from me which I also provided then you ask me 2 more times for this letter and then ask me 3 times more if you should change the debit order date which is why I contacted you in first place.

Now my debit did not go off for this month because who ever is working on my query is to *********** to follow a simple instruction.

Please provide me with a solution on this months payment as I WILL NOT pay extra fees because of this.