Terrible service

I am really frustrated at this point. I had an issue with my money being reserved by FNB. Ater many visits to the bank I finally found out what the reason for it being reserved is and provided all the necessary information. Nobody got back to me. After speaking about my experience on this platform finally the head of the department calls me apologizing for the inconvenience and asked for the relevant documents again. I sent all the documents again and then what I get ignored again. No response to emails nothing. It's been over 6 months and the bank did not send any communication and has reserved my money that I can't access. What is even more frustrating is that the amount that should be reserved was duplicated that means thay have reserved double the amount that they actually should have. When I asked about it they could not give an explanation. I really have no idea what is going on.