Bad Attitude and Insults

We deposited money in our flexi fixed deposit account like we did before many times for free...and this time it was R50 per transaction so in total R150 to put money in my savings...when we went to the bank to ask the teller said she told us about the cost but she didn't and insisted that we were lying...we being the clients...i have 5 accounts with fnb incl. My business account and now I'm being called a lier...i want my money back an apology and a call from head office or I'm going to the papers with this.