FNB Loans department bad service/inability to give answers on an error FNB made

Good evening, Would like to share my experience with FNB Loans dep. App**** for a loan all approved, sms received, money transferred into my Account. Used said funds following morning money was reversed. now i am indebted to FNB and they would like to issue a Section 129 for an error they made and nobody at FNB's able to tell me what the reason is for said. My entire account is" frozen", not able to effect any transactions. I Started investigating phoning the Loans department for the last week, Insufficient Call centre staff not being able to assist in giving me a reason/cutting calls/transferring me to another insufficient staff member for why reversal was made. No follow ups from FNB I as the customer have to do all the follow ups. When asked to speak to a Team Leader/Manager they are always in meetings. Today I spoke to Fiona and after she started investigating she phoned me back and said that she was also confused as she does not know what is going on herself. What to do???