Frozen account by *******

My account was frozen by someone trying to **** me they made a payment then reported my account to the ***** department, they are now demanding that I send them money and my private banking info, the ***** department has not once contacted me to hear my side of the story business is just standing still now clients are unhappy and my bills can't be paid. I have recieved a case number and the number of the person handling the case but 2 days straight of calling this person who never answers the phone!? Do you not care about your clients? The ***** department are just saying sorry if you don't speak to the person handling the case you won't be helped. I should never have moved to FNB, it is the worst decision I have made in my life.