An open neutral can cause some serious damage. The 240 volts between L1 and L2 now gets divided between any running items unevenly. High resistance items will see more voltage and lower resistance items will see low voltage. So your A/Cs could have been seeing 80 volts while your microwave was seeing 160. It all depends upon what was turned on at the time, and what was connected to each side of the panel. That is why it is important to check the power before plugging in, or having an EMS such as the ones from Progressive Industries which will disconnect your RV from power if something like this is wrong on the pedestal.
You might have permanent damage to items inside your RV now. You should check everything before you leave that campground. I'm not sure about who will have to pay to repair any damage that is caused by bad wiring in the pedestal. It would seem to be obvious that the campground is responsible, but who knows what is in the fine print on the agreement you signed when you registered.