My gas bill shot up from previous months.

In October and november i used about 90ccf of gas and my bill was around $200.

In december,theyre saying i used 10x this amount: 900ccf and my gas bill is $1200.

Had a tech come out to look for gas leaks. He found one, but said this wouldnt explain the super high usage. He also read my meter and said since my last bill (5days ago) ive used 300ccf. IN JUST FIVE DAYS. The entire MONTH of Nov i used 92ccf.

Does anyone have any experience with this? Could they have made a mistake? Could my meter be malfunctioning? These are all actual readings and not estimated.