Homeloan account frozen

I have a homeloan with FNB that has been running for over a year. It is a type of account where I should be able to transfer excess funds out of the account. When I tried to do this yesterday I get errors . On sending an enquiry through internet banking the response I received is that the account has been frozen due to outstanding FICA documents. How was the homloan account opened bond registered and monthly transactions being processed on this account for over a year if FICA documents are outstanding? I have also been an FNB client since 2013 with multiple active accounts. You happily debit my account every month with service fees and the monthly premium for this homeloan account but when I try to transfer excess funds out of the account then the account is frozen. Please sort out this mess ASAP or I will transfer my homeloan and all other accounts away from FNB.