Tasmac — collection of payment more than mrp

Address:

Chennai, Tamil Nadu

Today i have purchased a half bottle whisky from tasmac guindy near railway station outlet. Mrp in the bottle is 380 rupees whereas they have collected from me rs. 410. That is rs. 30 extra. I have asked them the reason they said this the rate if you want take it otherwise don't. They were not ready to give the bill also. Moreover behaved in a rude manner as well. I understood that they are selling this way only and publically looting the money from customers. Request the authority to take necessary action against this.. Please