Konkan Railway — selling mineral water more than mrp

Address:

Uttara Kannada, Karnataka, 581400

Yesterday i was traveling from honnavar to karwar from matsyagandha train. I have purchased 1 litre mineral water from the railway catering service vendor. Mrp of the bottle is rs. 15/- but he has taken rs.20/-. Vendor told that we are selling @ rs.20/- and i[censored] want to buy then plz pay rs.20/-
I have no other option so i paid 33% extra more than mrp