Bad service

I had a personal loan with FNB in which i have settled the loan as i was 30% discount but when i check on my app they is still an outstanding balance i did call the consultant and i spoke to Joyce Lepele on the 3rd of March 2019 in which she said the counsultant who had called me when i was making the settlement had given me wrong information i told her that was not my fault , she promised to speak to the managers and give me a call on the Monday 4th of March 2019 in which she didnt do so i only received an email from FNB with an interim Paid up settlement letter, i called FNb on the 5th trying to really understand what is really going on and i spoke to Mongezi Malawu who seemed not to have answers for me he said he is still seeing a balance on my loan i told him i dont want surprises on my account month as this will really **** me off surprisingly he just hang down the phone on me when i asked to speak to a supervisor is this how its done when i need to understand what is really going on with my account , am really frustrated i want nothing to do with FNB i wish i could even close all my other accounts i have and move to a different bank