I also fell for the gimmick of coupon (thousands off) and had placed order for Apple product, as with everyone, the product was never delivered. No responses to email to Timtara and CS calls - "product will be delivered in 2 days" or "we have escalated to concerned dept".
Cutting short - you can email their payment gateway (contact@Payu.in) with your order details , they follow up with Timtara to get your refund done. Timtara does respond to them and my refund was done in less than a week.
Payu.in customer service is excellent , they talk nicely and help. Hopefully you will get your refund too.
Lesson learnt - If something sounds too good to be true it is probably false.