Maharashtra State Road Transport Corporation [Msrtc] — paying more price than available at packet

Address:

Satara, Maharashtra

Journey from karad to pune: mh 14gu4336, i purchased chocobar of having mrp20 rs, i asked to pay 25 rs which is of 25%more than mrp. Hotel name: malabar restaurant. At satara. Which is authorised by msrtc. While asking reason of it, they haven’t answered. While asked for the bill of it or gst registration, they refused to answer with very very rude language.
Why common people need to pay more without a reason? Why msrtc had a contract with such hotels?