Accont not utalised and fees of R5921.55 outstandi

I had a FNB cheque acc and had a device and insurance. was placed in a new job so I opened an account elsewhere so my salary reflect immediately. i then went in to the mall at Reds branch to close account and advised that I was overdrawn by R2000 so I deposited that and expected to have the account closed. this was in 2012/ 2013 which by the way was never done. I went trough financial difficult so I did not apply for any credit but recently I got an free Transunion report and I was surprised to see that I had a default noted in 2014 for fees on the cheque account. I contact Sabelo who had advised that he could not see on his system if I had gone in to the branch to close the account and since I had no proof i am held hostage for the fees. Pay our we leave the listing. IS THIS EVEN LAWFULL. I worked for the other 3 major bank and never have I come across such. the account remains open and is to this day still opened and accruing costs. Is this the type of service FNB provides, Sabelo provided me with contact details of my last job which no longer existed. and then says that the bank tried to contact me. Mall @ reds branch is just has clueless and no one can help. SHOCKING...