Groupon India / Nearbuy — cashback not received yet.

You've an entire company for selling all kind of # but have no customer support beat it on call or chat. I was promised by this sick app a cashback of 400 rs which i haven't received yet. The worst part is i don't know how to reach this company because they have no contact mode. What kind of service is this? Please shut this app down! You've been doing a godless job out there whoever made this app.