Gujarat Gas — generation of exceedingly more bill.

Respected sir, i had received a gujarat gas bill of 1801/-rs. Having period of nov-jan 2019 which was so much higher than my previous bills.. So i called to customer care for rechecking of meter and they told me to rebate my money in next bill... But they neither return my money back nor rebated in my next bill... Rather they adjusted my paid 1801/-rs money in my last gas bill and not rebated in next bill so plz do needful for it... I have gone to office but they are not responding me properly... And now two more bills have been given me to be paid so plz do helpful as early as possible for my complain...