Shopaaz.com — Not refund my payment

Address:	Kolkata, West Bengal, 768016
Website:	SHOPAAZ.COM

I purchase a product through shopaaz.com. Order is sucessful message given by merchant, but some problem by mechant they message to me that your order is canceled and payment is refuned with in 7 days. But merchant could not refund my payment.
Order details
Order no - 106231, date - 10/05/2017
Payment ref. No[protected]
Payment amount-8499/-
This payment is now in paytm. I contact to paytm but they cannot respond.
Paytm order no-[protected]