Same here..I called them on it because there was no way my bill could be that high. Took a month or two but they fixed it back to “normal” use.
My meter simply broke and started to log 5 times the actual power use. I switched off every circuit except a 100W bulb in the crawl space and told them about it. Naturally they said it is not their problem, but my frige (or something) has gone bad and using too much power. Finally after a lot of calls and two bills that were about 5 times higher than normal, they came and replaced the meter.