I would call the electric company. At the end of our summer seasonal stay, we did not transfer the electric back to the campground owner. There was a good chance we might come back before the campground closed (which we did). The first bill after we left was $208. We were there for only 3 days of that billing cycle. Our previous bill was about $100.
I checked the meter and compared it with the bill and it was accurate. I called the electric company anyway to bring it to their attention. Over the phone they were of little help, but they said they'd file a dispute. A few weeks later, I got a final bill which had a $150 credit (included the 2 weeks use when we went back). Obviously they found some discrepancy.
It can't hurt to call.
-Michael