You haven't stated if it was a campground, or a newly installed pedestal at your home. If campground, then they need to spring for cost of repairs. If at home, the electrical installer needs to pay for repairs . . . even if it was you! Give us a little more information please!
Can't emphasis enough the need for a monitoring system. Personally we have a Progressive Industries, but there are others.
It has "refused" to connect to campground power on several occasions, alerting us to a low voltage, or miss-wired pedestal issue. Changed sites and problem with miss-wired pedestal was resolved.
On one of the occasions, there was a reversed ground/neutral. The solution was to move us to a site next door . . . then an hour or so later, a travel trailer pulled into the site we had just vacated
. . . which the office had just assigned them
. I explained the problem to them, and why it was a safety issue. Demonstrated with a multimeter. They moved to another site, office put ANOTHER RV is that site
, I went up, explained the issue, and the potential consequences, then offered to call the local electrical inspector and let HIM explain the problem
Then they called an electrician, who swapped the neutral and ground, and everything was hunky dory after that . . . .