FNB - the bank that takes money that isnt theirs

I called FNB to advise of the change of salary date - the lady in the call centre was unhelpful, rude and and totally not interested in listening to my request. She insisted that I obtain a letter from my work regarding the change of salary date. I sent FNB a message on the online banking regarding this. IT IS DECEMBER - not many people are still at work and I need that date changed or I would incur costs that are unnecessary. There's no garnishee orders or anything like that, its for a simple flippn loan that I needed the salary date changed. I changed the credit card date without hassles but yet for this, they insisted on a letter. Bearing in mind I am not getting a bonus this year or anything else. My salary is coming through the 30th only and now when someone put money into my account for a purchase I need to make on her behalf, FNB ****ing takes the loan money WHICH I EXPRESSLY TOLD THEM WILL ONLY BE IN MY ACCOUNT ON THE 30TH!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! FNB - the bank that takes money that doesn't belong to them. Now i have to explain to this lady why i cannot help her until the 30th of December. but believe me - FNB is loosing my business. I'm so sick of their unhelpfulness. How can a simple change of salary date be so complicated? I changed jobs what the hell am I supposed to do???? I've been banking with them so long, but i feel this now is coming to an end. I spoke to her on Monday - which means that this was already being loaded to be taken from my account. I hate incompetence and FNB is now on that level.