Indian Oil Corporation [IOC] — Refill supply related

Address:

PATHANAMTHITTA

I have booked and paid indianoil cylider refill amount of rs.745.6 through their app .Bill generated and paid on same day .Received notification on feb 04 to pay extra bill of rs 25(total to paid rs 770.6) for increase cylinder price.Generated complaint for this[protected] and received call from saroj gas agencies and compel to pay the 25 rs on delivery time and vey rude behaviour from the supplier side.
Should it required to pay the increased amount which bill already generated and paid on feb 02.