Piedmont Natural Gas

Any help or guidance would be so greatly appreciated. My husband and I just bought a home in July 2025 in east Charlotte. We’re in a 2 story ~2000 square feet. We got an unexpected bill from Piedmont Natural Gas in November 2025. We jumped from $30-40 monthly bills to $304. We were alarmed, but thought this is due to the weather change. December it went up even more to $512. I called Piedmont immediately because it was of course a big panicked. The call was unhelpful to say the least and they couldn’t do anything. We check and change our filters on the house regularly. Our vents downstairs are on the floor so we make sure furniture is blocking them. In January the bill was $431 which still hurts, but we figured it is what it is. Of note, we weren’t home for the first two weeks of January and had our thermostat set to below 65 degrees and it was still over $400. I just received our February bill of $763. Im at a loss for words and incredibly upset. Piedmont’s response is the same. They won’t send anyone out unless we smell gas. I don’t know what to do.