Unfortunately posting here on FT will have limited exposure. If you really want to get the word out post a review on TripAdvisor.com. MANY more people read reviews there and this just might get the GMs attention since it is likely to cost him bookings or get the attention of the owners who would not like to lose revenue.
Also, I would hope for a CC charge. The chargeback fee will get someone's attention and cost them more than just the charge. Wallets can be a very sensitive place.
But yes, Choice CSRs of little help. I had a place delay posting a stay and it overlapped another stay so they refused credit. I had to push for them to actually look at the reservation to see the dates didn't match and even then they were reluctant to fix it. I now dub Choice as NO Choice, it's gotta be the ONLY place available within 50 miles before I will book them, which is too bad since I have had some nice stays.