Poor service from FNB

I have received funds from a life policy and it was paid into my fnb bank account. Fnb has decided to put my funds on hold, saying that I need documentation to prove that the funds are legit. After providing the necessary documentation from the bank that deposited the money into fnb, and multiple phone calls, Fnb is still giving me the run around saying that the documents are incorrect. They are refusing to release my funds.

Poor service from FNB.