Suspension of account without reason

Very pathetic behaviour of FNB (first National bank) with clients. I'm client of FNB since 15 years and working on binance since last years. 4 Months ago FNB ask me about documentary evidence of some specific transactions and I immediately provided documentary evidence of said transactions since this then FNB has seized my personal account as well as business account which nothing to do with these transactions. About one hundred and ten thousand Rand are stuck in my three accounts.