Frustrated consumer

Hi People, I have an overdraft cheque account with FNB, they have handed it over to Blake n Associates. I finally was able to get the money, I want to make full settlement to the account, but I was told it is blocked because it has been inactive for a while, I called fnb n blakes more than 13 times to have my account unblocked so that I can make full settlement, still no help, been given a runaround, please advise what must Ido in such circumstances, thank you