Possibly did the coupon exclude use on the July 4th holiday?
I think it is never a good idea to express threats to discredit a place to the workers. It almost never works out well. (You might want to do it, but keep it to yourself.)
One time (not at Orleans but it doesn't matter) I wasn't able to pull up Free Play that went with the offer I was in on. Several Players Club people I checked said "try later, it's probably our computers." I kept trying, no success. Later, I realized that it was MY mistake, because I had waited until after the offer period to use the Free Play. You'd think that the workers would have been able to tell me what the problem was, but I also know (now) that Free Play is gone, bye bye, zip, won't show up in any form or fashion if you don't use it within the specified period. I didn't go ugly on them, and it was a LOT more than $10. Overall I've gotten a lot more from that property than what I lost from my stupid mistake.
If the Orleans people truly treated you disrespectfully (other than not giving you the $10) that is something else again.
Another thing...an LVA coupon isn't the same as a corporate offer. Had this been a Boyd generated matchplay, there might have been some sort of recourse.
Sorry you were disappointed.