Himachal Road Transport Corporation [HRTC] — about overcharging at dhaba

I am a traveller and used to travel to chandigarh from kangra almost after every month or 15 days. Today i am traveling in hrtc bus route number 912. There is a stoppage at nehrian for tea break. I think it is a certified stoppage for hrtc buses. But here i purchased a soft drink bottle of mrp rs 35 but they charged me for rs 45. Why, i am asking this question to government because i am a tax payer and paying tax for my income as well as everything that i purchased from market why should i pay extra rs 10 for this bottle? Is there any different tax system for this dhaba?. Same story for all hrtc stoppage point. So please take care of it. And i hope next time i do not need to pay more than mrp. Jai hind.