FNB Private clients home loans

I bank with FNB, I have been for over 10 years. My first house was with FNB, which I later sold. My car finance is with FNB, my current home loan is also with FNB, my salary goes into my FNB bank account. All the transactions listed above take place on the 15th of every month. 2 months ago I requested an additional loan on my current home loan and it was granted. However upon registration of the additional amounts to the loan, FNB decided they are going to change my payment date to the 30th of every month. This is after THEY GAVE ME FORM TO STATE WHEN INWAMT THE DEBIT TO GO AND I CLEARLY STATED THE 15th of every month. But for some reason they decided the 30th is what they will process on their system. I told them immediately that this was incorrect and NOT consistent with what I had requested on the form and also not consistent with my salary date. They then refused to change it, stating that in my payslip it says salary date is 30th. My problem is if you see my form stating the 15th and then you see my payslip stating something else, will you not then investigate the difference (this is easy because I bank with them and again this was not a new loan and previously I had no such issues). After a huge back and form they then agreed to change it, however said thier system needs 30 days so they will effect change after the 8th of April. It’s like I knew they wouldn’t do it so on the 11th I reminded my banker, who got back to me on the 12th saying that I must do a manual transfer to my home loan on the 15th because again the system skips a month and I’d have accrued interest from the months of April to pay in May if I do not do the manual payment. Now my question to you FNB is that WHY should I suffer because of the incompetence of your people. Why should I have to do the extra efforts of making manual payments when I had stated that my debit order must go through on the 15th. I told them to escalate the matter to management but no one seems to care. Also why was I not called or why was my banker not called to clarify the issue of the date before capturing it m the system. This is a 2 minute thing and if you care about your “private clients” so much this is not something that should be difficult to do. I will not be making a manual payment, FNB needs to sort this out because I also will not be paying extra interests because of people who fail to do their jobs correctly.