Account frozen

On Thursday, 7 June my FNB personal gold cheque account was frozen (with a substantial amount of money in it) without explanation and without even telling me it had been done. After many phone calls made by myself to FNB, i was told it was due to suspected *****. I provided FNB ***** department with evidence (copies of IDs as well as a copies of messages) proving that it had been a legitimate transaction. It has now been a week and they have not come back to me and my account remains frozen. How do they expect one to live and work when they act in such a high handed manner. To date i have not received even a single phone call from then... Pathetic service!