the final Frontier

Stardate 4/22/2024 : I booked the cheapest flight, via Frontier, but forgot to read the
(awful) reviews. Expedia has a rule if you make a reservation you can refund free of charge within 24 hours but I called them and they make you refund through Frontier. Which does not even have a customer refund/complaint phone number. Not quite delivering what they promise on the part of Expedia.
So the Frontier scam goes like this: you get to the airport and if your backpack doesn't fit into the 8x18x14 inch "sizer"(at the GATE) you have to pay 99 bucks. No middle ground or fifty shades of grey. They want a Benjamin. Pronto. Or no bordo.
So looks like tomorrow I will be wearing four sets of shirts under my flannel shirt. And stuffing socks and various items into my pockets (is that a banana, sir?) so that my backpack will be more floppy and fit into the sizer. Maybe even my laptop under my shirt (make that shirts) if I am feeling brave.
Has anyone been through this Frontier hassle before? Turns out the gate agents receive 10 dollars every time they can net another sucker with baggage that won't fit. And consequently a 100 M class action suit is going on since November, but the practice still goes on...whatever happened to cease-and-desist?
Update: looks like if you take a photo of your luggage fitting into the sizer you can successfully do a chargeback on this scam.
https://www.reddit.com/r/Flights/comments/133bh0h/frontier_baggage_scam/

We went to Cuba last October, via Sunwing, from Montreal. (WestJet recently bought Sunwing). The all-included package included 1 free checked bag/passenger, which we used. At the Montreal check-in, Sunwing's check-in agent looked over the counter at our carry-on and said "That's $25 for your carry-on."
Me: Why?
Her: It has wheels.
Me: So what?
Her: If it has wheels we have to charge $25.

What are you going to do? I paid.

Coming home, at the airport in Varadero, Sunwing's check-in agent did the exact same thing: looked over the counter and said we had to pay $25 for the carry-on, "because it has wheels."

I paid again.

At no time did either of these check-in agents make any effort to check the size or the weight of our carry-on.....just a quick glance and the statement that we had to pay $25 "because it has wheels."

Clearly, Sunwing has instructed all its agents to charge $25 for ANY carry-on that has wheels. Nothing but a scam to squeeze another $50 from unsuspecting travelers.

I checked Sunwing's small print, and our very small, wheeled carry-on is within their posted weight and dimensions for carry-ons......including the wheels. The small print mentions nothing about "wheels" being a disqualifier.

Still pissed-off several months later, I lodged a formal complaint directly with Sunwing. They responded quickly with a statement that review of my claim would be delayed, apparently due to an increased volume of complaints.
What a surprise.

If Sunwing refuses to refund my $50, I'll escalate to the next level.