Reliance Mart — collecting excess amount over mrp

Address:

D.no:65-12-7/1, Kala Venkatrao Street, Narasanna Nagar, Kakinada, East Godavari, Andhra Pradesh, 533001

On 16-6-19, I have buy some beverages along with 7 Sunfeast Farmlite biscuits packs on offer of buy one get one free, because that offer I have purchased 7 packets. The MRP of said biscuits Rs.25/-each, after I paying bill that I surprised Reliance has collected Rs.30/-each, I.e Rs. 5 excess, when I asked for offer packs and excess amount collected from me the staff billing station given arrogant and evasive replies. Required immediate action.