Need refund, got refunded for 1 but I bought 3. Refund is closed but I still refund for 2 more.

[greatfindsoutlet]

I purchased 3 light fixtures from a seller, received them and discovered the first one missing multiple parts.  After messaging, only solution was to get a refund for item.  Later that day, my husband, while installing the other 2, discovered they also had more missing pieces.  I contacted seller but he refunded only 1x item and closed the refund request.  Now, I can't seem to be able to request or ask eBay to step in because the refund chat is closed.

How can I reach ebay to fix this issue?  Seller should be warned this is not ok - What do you recommend I do in order to open another refund with eBay?  It is just simply not allowing me to do it as it claims I already go the refund.  But the order was for 3 items not 1.