I really only handle chargebacks as a final “nuclear” option

As it should be. I have to deal with customers who literally wait until they see I generate a tracking number and scanned in at the post office before they call their bank later that day and file chargeback because they know half the time small businesses aren’t diligent enough to respond within the 14 day window provided by the banks in the chargeback process for refuting a dispute.

I also have a pretty long and fairly steady history witb said CC merchant. So it’s clearly not a pattern or abuse. I’m thinking I’ve maybe filed 3-4 in the last 10 years. And that’s with an average of 200-500 transactions a month on the account.

Yeah, as I’ve recently discovered, credit unions tend to offer better customer service than banks these days for all things from loans to banking in general.