Sorry I can't be of much help there. I checked Jobslinger.com and although they list a lot of countries, India is not one of them. You might try Gapbuster and Bare International. Possibly if you Google "Mystery Shopping India" on your local version of Google you may find forums that could give you leads or companies that do shops there. Similarly a Google of a particular local retailer of reasonable size and number of locations along with 'Mystery shopping' may give you some leads.