VEO Energy Systems

Hi, I have this VEO propane for my upstate house, which is winterized, and I keep on getting crazy high bills. Every time I call, all they say is you need to pay this bill within 30 days, or there is a leak somewhere, or the meter is broken. Something doesn't make sense. From last month's billing cycle, I was there for 3 days, and my bill is $138.30; the rest of the time the unit was closed and winterized. I spoke to my neighbor there who didn't winterize; he has his heat on 50 all year round and his bill last month was less than $130.00, less than my bill. I would appreciate it if you can look into this matter and get back to me as soon as possible. Thanks for your help.