Fnb ineptitude

I invested five years ago and was paid the interest into my current account monthly, I had it paid out end of October and want to invest it somewhere else. Now FNB are holding the money and asking alsorts of questions needing proof. I told them that they have seen that the interest was paid monthly into my account for the past five years and they are now delaying the whole process and it will affect my interest the longer they hold it. It is my money honestly earned? I told them do they look into the *****ed politicians as well who ***** billions not a paltry amount as I have?!!! I am 73 years of age and need the monthly income!