FNB treating customers like *********

My account was placed on hold 7 days ago. Till now, nobody has called me to explain what is happening, my life savings are frozen and this is causing me a lot of stress. I have received an email with no concrete explanation from a lady who appears to be very dis-interested and does not reply any emails nor does she answer any calls. Being treated like a ******** by a bank I have banked with since being a child. How do you justify freezing an account without an explanation?