Dotpe, Ammi's Biryani — Food delivery order not completed and amount not refunded

I had ordered food from Ammi's Biryani at 7:45PM and payment/ delivery partner was Dotpe. Cash on delivery option was not available so I paid in advance. But I did not receive any food. Later they gave silly reasons that delivery boy was not available and they called me after 3 hours at 11 PM to ask the address when I was sleeping but I rejected that and asked to refund my amount. But they did not refund my amount. I think they are running fraud business.