fnb *****s from their clients

I am in the restaurant industry. I have an fnb credit card machine. atleast once a week their machines are offline and I cannot get bills paid as customers want to leave. when I call the card division there is not much they can do. I have signed a contract with the card division to deduct 2.5 percent for debit cards and 3 percent for credit cards for their fees. they have been currently debiting more than 10 percent for the past 6 months. I have been into various branches and nobody can help me. do not use fnb as they ***** money from their clients and pass the buck on to other \ departments"I still have not received any feedback to date. they are the worst bank to deal with if there is anyone that can help me please assist. it is alot of money that they have ****** from me"""