@Rebecca2096
I sense your confusion over this...and my take is this. I'd be thankful that they told me about the towels. Perhaps you can retrieve them at the bathhouse, or the campground office. Otherwise just call it cost of doing business, and replace them. Same with the kettle. These things happen. Having spare towels sets is a necessity for wear and tear, stains, quick turnovers, etc. May I guess that the camper uses propane? It is much hotter than the gas in a house in town. Most people renting a camper don't know that.
Happy hosting to you, and may you have many more delightful guests.