Frustrated by FNB

I want to lodge a complaint with Fnb premier and the worst of them all NAV MONEY. They have a tendency of not taking the customer seriously. I pointed out that there is a duplicate amount being my bond of which is salary deducted and it is included as part of my commitments when an affordability assessment is done. How difficult is it for the technical team to fix this error? Instead I am told it is the information that is pulled from the bureaus, why is it that they cannot pick up that is PAYROLL DEDUCTED? This is puts me at a disadvantage and it looks I cannot afford. I have sent emails to care in turn they waiting for NAV MONEY to respond when THEY fill like it!! I AM CONSIDERING SWITCING TO ANOTHER BANK THAT SEES VALUE IN THEIR CLIENTS. AFTER ALL I HAVE BEEN WITH FNB FOR 15 YEARS!!