Groupon India / Nearbuy — cancellation issue

I bought voucher worth around rs 1300 and called the number of outlet given on app, nobody picked and when i went there i was denied because i did not booked in advance. Now after ruining my night there is no option for cancellation on my app and when i bought it said it was 100% refundable. Now on there app there is no link for getting the cancellation which shows their fraudulant behavior. I am pressing charges for harassment and refund of my money.