Gujarat Gas — Dec jan and feb bill of 331rs only then given bill of more than 4000 rs

Address: Surat, Gujarat

Website: Gujaratgas

Dear Sir,
I am timely paying bill of Gujarat gas since 7years, my customer ID is[protected] old customer number 10283391, We get minimum bill of 331 rs for consecutive three months then in February I got massive bill of nearly 4000rs,
Why so much bill without high usage?
How bill was created?
Which unit was accounted for last four month?
Dear sir, please do needful to get money back and give justice.
Regards,