Sounds a bit fishy to me. Like the rv park got his freinds in there. I would definitely hold them accountable for what they did. Especially if i had taken off work on vacation, and now had it cancled for really no good reason. I can see if somthing happened, fire, tree fell, flood, but so someone else that wasnt booked allrady can go and camp, no way. I would be blasting that park everywhere I went. My time is as valuable as everyone elses. I think the park owner created the problem. Not anyones fault your large group can't get a site on short notice, plan ahead.