FNB is a disgrace

Hello, it is with great disappointment that I am typing this message.First National Bank has freezed the account of a Forex Trader that we invested in ,as they claim that the investment business is a pyramid scheme, so what I don't understand is why are they only freezing the account now , is it because the account has grown big and and now they see it as an opportunity to take the money that we have worked so hard for and use it for their own good because we know FNB ran loses at their last financial year, so is this the way of cleaning their mess with our money? , we have been receiving our payments without any interruptions for the last 8 months via FNB, now the account holds a large amount of money that we invested and they just decide to freeze the account... The management is not fair at all because they know exactly how the money got to that account. We need our hard earned money. Thank you for the service