Tasmac — Collecting more money than MRP

I visited Elite TASMAC Vijayanagar on 10/6/22.bought a bottle of BLACK &WHITE Scotch whiskey. The persons at the sales counter wanted me to pay Rs1900. But MRP was only Rs 1850.last month also I had the same experience. I observed that they collect Rs 50 extra from every body. Why this is happening. I was very particular not to pay more. Then they reluctantly accepted Rs 1850 . But no bill was given. They collected extra from others can't the government stop this or ruling party members are also involved in this.