Fnb overdraft poor service

Good day I have been a loyal member to FNB and had an overdraft with them. Due to my personal reason , my overdraft limit amount was handed over to an attorney and although I am trying to make payments to reduce and remove the debt, FNB constantly charges me interest on my account even though the attorney is handling it thus resulting in my overdraft amount escalating monthly for no reason. Please assist me by removing the interest and allow me to pay the account up to date and have a 0 balance.