FNB gives the worst customer service experience!!!

I am really not happy with FNB, they provided the worst online service to me, then over charged me, then they tell me its valid charges without asking me the full story so I can tell then how there bank teller messed up my account...I want my money back ASAP, I will not leave it like this...Michelle from Ottery branch was very helpful but the rest not at all...I AM SO ANGRY then all they do is respond to my mail to say charges is valid...not even asking what happened,,****** HELL!!!!