Shoppersstop.com — shoppers stop stole rs 2500 from my order

Address:

Bangalore, Karnataka, 560034

I placed an online order for a Jacket in the first week of December 2018 using my MakeMyTrip Cash Voucher of Rs 2500 (it's equivalent to cash amount which can be used at number of outlets) along with some additional amount from credit card. Later I got a message saying that the product is out of stock and they cancelled my order. And there starts my endless wait for my money/product/voucher back. I asked for refund and was sent a voucher on E-Mail. When I tried using the same, it didn't work. They again sent another voucher which again didn't work. When I called back again and was told that it's a sale season going on, so now I need to wait for few days before they can issue a new voucher of same amount which can then be used on another purchase. It was already strange but I managed to agree. Few days later I called again and I was told that I will need to wait till March 2019, yes 3 months, to get another voucher which can be used on another purchase. I have been dropping them E-Mails since 1st March, with no replies from them. I have attached the mail relevant mail threads.
I have used several other online shopping portals before (Myntra, Jabong, Flipkart, Amazon) with great service and products, and I am definitely never going to place any new order at Shoppers Stop ever again, but it's sad to realize that Shoppers Stop is into stealing money from their customers. I wonder if this is eligible for a police complaint.