Attorney Allegedly Yells At Client at Crowded Lowe's Store

I don't recall a course in collecting monies from a client in law school, but even without instruction I'm not sure this is the right way to go about it:

Some attorneys may firmly go after their clients if owed legal fees. But angrily claiming someone is delinquent on a payment in a crowded public space?

To one local resident, that wasn’t only unacceptable, it was cause for a lawsuit.

Especially since, as a complaint filed Friday in Marion County Circuit Court alleges, Ron Butler doesn’t owe the attorney, Henry Ferro, a dime more than what he already paid him three years ago.

That amount, according to Butler’s complaint, was the flat fee of $3,500 for Ferro’s work defending Butler’s son in a 2007 criminal case. Yet Ferro allegedly believes Butler owes a significantly greater amount: $14,000. And he has been demanding payment, according to the complaint, through harassing phone calls and, most recently, in a crowded Lowe’s store in Ocala.

There was no fee agreement signed.

What's wrong with this picture?