FNB HOMELOANS

How difficult can it be to change a deduction date on one's FNB home loan? I have been a client for 12 years, always had the same deduction date, when I try and change the deduction date now, they cant get it right? No deduction gone off my account for month of May, took me the whole day to try and sort this out, still no feedback. Kept me on the line for 40 minutes this morning, not speaking to me, still no result. If this how you treat your private clients?, Pay a big fee to be a "private client" and this is the service I get? Will be changing home loans and accounts.