Consumer Redressal

Hi team, I have bought 1 trouser and 2 shirts from Mulund Shoppers stop on discount during July\'14 sale. I noticed that shop is cheating public. Normally on MRP price is VAT is already included. What Shoppers Stop does is after discount amount is deducted they charge VAT on entire balance MRP amount after deducting the discount.They should charge the additional VAT amount only on the discount amount not on entire balance MRP. For e.g. If I bought goods worth 10000 at 10% discount Shoppers Stop is charging additional VAT on 9000 instead of 1000. Could you pls take this issue with the as they are cheating common public.