eBay — Cheated by seller and eBay is not taking any responsibility

I had purchased a cross trainer from eBay India for my parents and paid full amount with shipping charge when Item was delivered seller again charged shipping charges and the item was delivered with missing spare parts, I contacted eBay india customer service who asked me to contact seller for shipping charge as well for missing spare parts, Seller said he will return shipping charge and provide missing parts, and took bank details for refund first seller said he couriered spare parts and it got returned for some of their technical problem and told he will send it again, then after a week when again contacted he told spare is out of inventory and still having problem in refunding shipping charges as he did not received payment and asked me to contact eBay and fullfill payment their When I contacted eBay customer service they asked me to tell seller to contact them, which I told Then seller asked for providing photo of missing spare part to arrange it, which we provided and ask him to return extra shipping charge and spare part or we will go for refund then he refunded shipping charge into my account and told he had courier the missing part again... which we never received, we again ask him detail of courier so we can track, from then seller stopped responding and had not provided missing spare part till date, in all this seller had taken more than 45 days, when I contacted eBay they asked first asked file for refund and then told me it can't be done after 30 days and were asking me to cotact seller who is not responding I had asked eBay to talk to seller as I had bought this from eBay, I had many chats message and they never seems to bother, now whenever I chat with them they disconnect my chat rather taking my concern seriously where seller had cheated and eBay india is not taking any responsibility for it. It was eBay who asked me to contact seller and we trusted seller initially but look like he was just buying time to pass 30 days of guartanee period, once that gone he stopped responding and eBay whom I had always contacted within 30 days and after least seems to be concern to address my grievences Please advice