High Bank Charges

Ive been with FNB since 2009, but it is with great sadness to inform you that i am withdrawing from being their client. Since last year August, this bank had been reversing my debit orders and they would charge for reversal. When i went through my bank statement to find out how come the debit orders could not go through, i discovered that i had sufficient funds but for some strange reasons FNB would not reverse it. As a results i ended up with high charges. I then went to the branch at Pinecrest mall to querry and close my account, the indian male (chubby) consultant from FNB told me that, because it was sunday they could not assist me as they had limited banking on Sundays. My lay months bank charges were R1756.00 of which i do not understand how did i came to such high charges. Mind you this is a personal account and i hardly use on withdrawals or at store purchase but the charges are so unreasonable high.