Tell them to take a hike. This company has at least 25 similar names on Ebay. They bid on thousands of items per week. They bid on behalf of customers in Japan. They paypal the sellers, the seller ship to Cal. The company inspects the items and then forwards the item to it's customers in Japan. You can be sure that this item was broken by them. Otherwise, you would've heard from them in May.
Tell them that they broke the item. NO SELLER on ebay is responsible for items that they receive and then forward. Tell them to reimburse their customer and to leave you alone.
Unfortunately, you canNOT block them. They have way too many companies. The names are the same with the exception of the numbers.
What I truly believe that Ebay should do is allow sellers to block these types of customers. My problem with them is that sometimes, their staff is incompetent or overwhelmed since they buy so many items. I sold them something earlier this year with one of my ebay names. For 2 weeks, they kept emailing me and asking where was the item. Yet D.C. showed that they had it. Finally, they found it and posted my feedback.
I would NOT reimburse them anything. It's too later for feedback. At least , block this one ID but rest assured, that they will probably bid again.
They do provide a good service for their non-English speaking customers who pay them a premium plus the cost of the actual auction.