Charge higher price than MRP

Location/place: Ahmedabad

Name of company/service: National Handloom

Yeasterday, I visited National Handloom S G Road Ahmedabad,

I purchased 3 pack of Godrej Cinthol soap.

Mrp of this price is 65 Rs. & National Handloom Charge 71 Rs.

Now I am confuse that how any one can charge more than MRP.

I want to file case against national handloom