Shoppersstop.com — Charged more than MRP of the products

I have purchased two products from Shoppers stop online store and they have charged more than the MRP written behind the product. They have charged 200 extra i.e. 1450 for Mac Mini-Lipstick which costs for 1250 and 100 extra i.e. 850 Mac Prep + Prime Fix+ / Mini which costs for Rs.750. I have sent emails and also raised complaint through their customer portal but of no help. I need refund of Rs.300 that they have charged from me. This way they have scammed many people so need to take action, hence raising this complaint.