Fnb ***** department

I have been with FNB for many years. I tried swiping my premier debit card today to realize it kept declining. I thought it was my daily limit. And was trying to sort it out. But failing I called them more than twice. Only to found out that my account has been blocked due to suspected *****. I explained I know nothing about it. And was told to wait for investigator call as they too cannot happen. All my money is in the account. I must wait upon them for how long an answer couldn't be provided.