I went to the food court in Ambience Mall, Gurgaon on 3rd June 2011.
I purchased a minerel water bottle of AQUAFINA and was charged Rs 25 (including VAT of Rs 3) and was given a bill # 28275.
The printed MRP on the bottle was Rs 15.
On challenging the sales man at the counter (his name was Baljit), he said Rs 25 was the only price he would charge and I had no choice but to take it because he had already printed the bill.