Big Bazar(Future value retail Ltd
Not charging as per MRP

I have purchased few items from Big Bazar, Kalyan (Metro Junction) on 17.7.11 as per challan No. 185752, totalling bill amount Rs 1242.72, Out of this purchase in one item Chandrika soap the MRP was written as 120/- but the Big bazar charged Rs 125/- . Further this item was given an off i.e. Rs. 105/- was there price. leave aside this offer. The original MRP printed on this item is Rs 120/- but they charged Rs 125/-

Earlier also in various items they charged more than the MRP the details are available. please help.