FNB REAPING OFF ITS CLIENTELE!!!!!!!!

I have been a loyal customer to FNB for a while now. I pay my dues to them on time and comply with their rules and regulations to the best of my ability. I am an online trader and recently someone made a purchase from me. The long ang short of it is I released the purchase to the buyer who after 2 days of the transaction reported that I had de*****ed them. Without any warning from FNB, they automatically froze my account on the 1st of November!, when my rent was due! I have been evicted from my domicile as a result. When I went to the bank to enquire I was told someone had reported that I had de*****ed them, hence the reason for my account being frozen. When they informed me about the amounts in question I showed them the transactions I had with the complainant and that the complainant had made a purchase from me. They told me to email the documents along with a police report, which I did the very same day. It's been a week now and after numerous emails and phone calls I still haven't received feedback from the ***** analyst handling my case, in fact FNB representatives I have spoken to via email and telephone refuse to letme correspondent with the analyst, for reasons best know to themselves (FNB). I HAVE DONE NOTHING WRONG, I HAVENT DE*****ED ANYONE YET THIS STUPID BANK (FNB), even after sending them documents to support my case is SILENT ON THE MATTER, NON RESPONSIVE!!!!! This is the ****iest bank in the history of banking and their support is PATHETIC at best!!!!!