Fifth Third Bank NSF Charges with a positive daily balance Cinncinnati Nationwide

Is it not fraud for fifth third bank to charge NSF charges when the account is, in fact, not overdrawn? I have been doing business with a bank named First Charter for years. Earlier this year 5/3 took over. I have never been charged NSF charges before, while having a positive balance, but can't say that anymore.

What really stinks of fraud or scam is the fact that I saw where my daily balance was positive, but my available balance was negative, so I took a cash (CASH) deposit to the bank to protect myself. I was charged 4 NSF fees for 4 charges that did not post for 3 days after the charges. My deposit was ignored. I was charged the NSF fees regardless. To add insult to injury, my account never fell into negative territory, even after the NSF charges. Is this not fraudulent?

Rich
Bessemer City, North Carolina
U.S.A.