Frozen account

I am very much unhappy in the manner that FNB deals with us customers.I had money deposited in my account which is for work done from a contractor.

My account has been frozen and I cannot access it for some time now and I do not understand why.

I went to East Rand Mall branch and they just informed me that I cannot access my account and I need to speak to my contractor.

My contractor says he has paid me and wants nothing to do with me. FNB is my bank which means they are *****ing my money.