Facebook Marketplace — order something and got something by shiprocket

Address:	411027
Website:	www.facebook.com/marketplace/item/413972579289511

I had ordered from facebook marketplace
Whatsapp no seller [protected]
Ordered jacket and got used tshirt by shiprocket order no[protected] from j. King ecom exp and awb [protected]
Received 9 nov 2019

https://www.facebook.com/marketplace/item/[protected]/

They said returned in 4 days but no any return option and no confirmation massage from them.
I called to shiprocket cust care but they said i don't have any information about seller i dont have any access to share you.
No any information on bill about seller there are only mentioned j. King
Please help for refund my money