Coolwinks — did not return my money

Website:

coolwinks.com

I ordered a pair of glasses from this website of rupees 2215 with a cashback offer of 2000 to my bank account. Their offer said money will be refunded after 14 days of delivery. After the 14th day was over, I checked my bank account and there was no refund, so I contacted them, they said they will process it within 48 hours, I waited for the next two days but nothing happened. Then I contacted again saying the same and again they agreed for 2 days times but failed to process it. Now I can't reach them through phone and since yesterday I've been emailing them for this. The money has still not refunded even after 20 days of delivery.