Ebay India And Amr Enterprises New Delhi - Product is not as per seller description

I purchased a wifi router from a seller on ebay.in, Mr. Moin Uddin, F-**/*, Shaheen Bagh,.Abul Fazal Enclave Part -* , Okhla ,New Delhi - ******,Phone **********.
The product description on Ebay website shows that the antenna capacity is * dbi and antennae are detachable/removable and the router is having reverse SMA connector. I actually wanted the item as per seller description.The product I received TP-LINK TL-MR**** is not as per seller description. I wanted the router with detachable antennae so that I can upgrade them.But the router has non detachable antennae.The seller provided misleading and wrong information.I wanted to return the item and requested a refund.But ebay rejected my request saying that they tried to resolve the issue,but the seller is adamant and not willing to accept the return.They also informed me that the seller wanted me to visit TP Link customer service since the product is under warranty.But there is no point in visiting the service centre as the item does not have any manufacturing defect and its inbuilt antenna cannot be separated.I purchased the product purely based on the facts provided at "https://www.ebay.in/itm/************?ul_noapp=true". I want to return the product and get a refund since the product is not as per seller description.