Amul / Gcmmf — complaining about selling a product more than mrp.

Respected sir,
My name is shubham dhuri. I am living in dombivli, mumbai. I am writing this mail to draw your attention to a very important topic.
Amul buttermilk a product of your company has a mrp of rs 10 which is clearly written on the pack. But the retailers in my area are selling them at rs 11 which is absolutely illegal. When i asked them why they are selling more than mrp there was no answer. Being a responsible citizen of this country its my fundamental right to get a answer.
I hope you look in this matter as soon as possible.
Thanking you.