Firstcry.com — Amount deducted for order and then cancelled order

I have placed a pre paid order of Rs.1772 on firstcry app on 15th Oct, but they have cancelled my order next day and didn't refund the amount.
When I called customer care for the same, they mentioned that in June you returned some wrong product for and order so we have recovered the amount for that. Whereas no such information was provided to me when I returned the product. And I returned the correct product only which was delivered to me.
But they have kept my money and denying to refund it.
Kindly help to recover my money as they are cheating their customers by wrongly deducting money from their orders