My account is frozen for no reason!!!

I received an sms from FNB to say that their are outstanding documents and that I must phone them to find out what they are! This is just crazy customer service! In the meantime, they froze my account, without telling me what they needed so I could do something about it. I then phoned them to find out why they have frozen my account and they said they needed documents to FICA, I asked them \WHAT DOCUMENTS?"and they said they do not know they will need to escalate....In the meantime they have frozen my business account which runs my B&B and now I can do nothing!!! TO JUST FREEZE MY ACCOUNT IS CRAZY ESPECIALLY WHEN THEY CANT TELL ME WHAT I HAVE TO DO TO UNFREEZE IT! I always liked FNB"