Sadly, that no refund policy is found in many areas where we go to get warm and see some sun. Quite prevalent here in the RGV too.
Try listening to construction on both sides of your unit from 6 AM till midnight for weeks on end. Hammers, air compressors, and be still my heart, our all time favorite, the large earth moving equipment with the back up beepers.
Sorry you had such a bad experience. With any luck, that campground will go out of business and none of the rest of us will have to put up with that silliness.