My account is on -R17417, Bad service and lies

Hi I tried to do a transaction 4 times and it got reversed. However, now FNB is saying my account is in excess on R17417 . So, I have contacted FNB everyday for last past week ( I called the Premier team, chat with them, I went to centurion mall and sandton city branch to get help) and nothing has happened yet and even a call back as promised. The first 3 days the premier team promised that I will be resolved automatically by next day and contact me for an update unfortunately that was a lie. The 4th day I went to centurion mall and asked to provide a receipt that shows that the transactions were not successful and by tomorrow it will be resolved, I provided that proof again nothing happen. The 5th day I went to Sandton city branch, they (Consultant and the two managers) asked for the same proof and made me filled some papers(complain forms) and we call the premier team to have more info, by then they told us by saturday I will gave the money reversed and today it is Monday nothing has happened yet. The sandton branch consultant promised to call me the next day for an update on my complaint and again as usual no one called. Hence, FNB is failing to sort this out