FNB processing an unauthorised payment

I logged a call to FNB the 31st of July 2015 disputing a transaction which I requested them not to authorize.I was on business trip when this transaction took place in Egypt. I log the query FNB website-on-line banking and I informed them not to authorize the transaction ,and during that time I could see that the transaction was still on hold(in their suspense account).However to my suprise when I got to South Africa I realised that the transaction was processed through by my bank despite having completed the forms sent to me by FNB.I've disputed this four months back and I keep getting no response. I've been pushed from the dispute departm<br> ent to the Private Banker who contacted me once since the incident. The service has been pathetic from the 1st day which was in July till today. The biggest shock was when I go copied in an internal email that was not meant for me. This is indicative of the incompetance that I've experienced in the last 4 months. From incorrect forms being sent to lack of proper feedback from them. I'm not prepared to incur a loss for their own incompetence. I prepared to fight this till the end. This is my last effort to get them to respond directly to me.