FNB Ridiculous System Limits

My business has been banking with FNB since inception, 3.5 years ago. Ever since they changed their systems 3 months ago, I am restricted in the use of my own funds - not overdraft - not credit card - my own funds. I am unable to pay my creditors on time, because their system doesn't allow it anymore. I have gone in to the bank personally, verified my browers and devices - but still the online banking system does not allow me to exceed a "so called limit" which is system set. its been going on for 3 months now - this is crazy