Indraprastha Gas Limited [IGL] — billing issue

Address:

New Delhi, Delhi, 110085

As i am the customer of igl and use the service but due some rubber pipe issue from october 2017 to january 2018 have read the excess meter reading.
After change the pipe my monthly consumption only 3 to 4 unit. I have already regular follow up and mail regarding this that based on current consumption please rectify my bill but problem still resist.