I can't see both sides of the story equally, but my take is that they made an "attempt" to cover your vacated reservation.
They are refunding you 2 nights which is better than nothing.
A private campground is probably operating on a smaller budget than a major airline.
Policys are put in place for a reason.
You are asking them to bend the rules for your benefit.
2016 Ford F350 CC 6.7 4x4 SRW (Ghost Rider)
2017 Cougar 29 RKSWE (The Tumble Weed)
Connected by a Curt 15K WDH W/Sway Control