Banking with Bank of America?

I just got off the phone with them again! I have had such a bad experience with they lately and nothing is getting resolved. They made a mistake on my account back in March resulting in a late fee which they said they credited, but didn’t. Since then they have been charging me a late fee each month, because the first late fee keeps showing up as a past due amount. Todays statement shows a credit for two late fees, but the past due amount is still there and I was charged another late fee! They also jacked up my APR to 29.24%, because there was two late fees within a twelve month period. The late fees were charged, because the first guy never credited it. The lady said there was nothing she can do about it.

Sorry for going on about this, but I don’t know what to do. They left me in tears. It pisses me off, because the mistake was from there end in the first place and now they have made it as if it was my mistake. Their customer service sucks! Any advice?