Indian Railway Catering & Tourism Corporation [IRCTC] — food meal rates in train by caterer

Suresh prabhu irctc e-catering irctc i need answer for my query traveling through mumbai express from renuguntha to pune coach a1-4&6 i think irctc has fixed some veg meal prices in train then also vendor asking 120rs for dinner meal insted or rs50 on asking for a bill but person ignored many times after raising voice got a bill (Attached) which has no gst no after asking told me that price paid by me rs120 is excluding gst after asking for rate card i received a menu card showing meal amount (Rate card attached) communication is done with pantry manager name aditya singh sleeping in pantry on underwear is this a on duty manager??? (Photo attached) after taking all proof manager get ready to return me 500rs for my meals tea and breakfast purchase what can i think its a bribe or refund of my wasted money??? I want answer for same