Account frozen

I recently open FNB account and someone deposited R2900 and the following day we withdraw the money so that we can use the money . Then there were 500, that was deposited by my sister, then 500 deposited by someone , all my deposit went to R6500 boom the account was closed . i did not know that the account was closed until someone who was trying to deposit money into the account coundnt. and she ended up phonng the bank and the bank told her that the account was closed because suspected as if we are doing ***** , because the money was coming in and out , mind you i only withdraw 2900 and the deposit was only 6000. when we phone we were told that the person who was supposed to depost the money is the one who reported the account. How can she report us and ending up paying us on other banks . R6000 is a ***** ? realy? . When i spoke to the lady she said she is willing to take this matter further as her name is being used as an excuse . its been 3 days still waiting for a call from FNB and nothing . i wonder what do they do with all those money that they froze for poor people . Maybe someone inside is enjoying those hard earned moneis. FNB is a horrible bank