Pathetic service

I have called , and been calling for two weeks now trying to change my debit order date , the lady i spoke to informed me it will be changed, I called again to confirm and i was on hold for over an hour , I tried to do it online around the 18th and it still hasn't been changed. I called today , and i was informed that it cant be changed, with zero motivation to help , even though the fault is on your side now its to late , MY account is in arrears already and now its going to be again this month ? this is pathetic service , I would never do business again with you guys in the future