Disgusting service!!!!

I received a payment from a client for a car that he bought from me on the 11th of November. Within 24 hours of receiving the payment, my account was frozen. I went into the Menlyn FNB branch and was told that the person who paid the money into my account was under investigation for *****. I was given a case number and told that I need to send Proof of payment and documents to lucille Graham and my account will be unfrozen. I sent the documents and tried to phone her but the number stays unavailable. I have been to the branch 5 times in the last few days with no avail or answers! I have phoned the ***** line and rmailed every fnb email that I could find and everytime they say I must speak to miss Graham but how can I if I cannot get through to her. Today when I went into the branch for the 5th time, I was told that no ***** is picked up on my ID number so they don't understand why my account is frozen, but STILL NO ANSWERS OR UNFROZEN ACCOUNT. I have asked to speak to the manager but he is also busy the whole time! I have 2 children that need milk and diapers and NO MONEY AS MY ACCOUNT IS FROZEN!! Case number ***