21-10-2020 4:02 PM
I think this is a case where it would be worth reporting this to the police - if you do so I would not notify him that you have done so. Please do so in writing [not by e-mail for example] and include copies of any messages. Explain that you do indeed feel threatened by the messages.
Again get all the evidence together [copies of all his listings] and send them to Trading Standards for his area + even HMRC [!!] with explanatory letter.
I am not sure what you mean by "asking for a refund". That's not how it works. If you feel there is something wrong then do not contact the seller at all. Simply open a "not as described" case in eBay's resolution centre. This means that eBay are on board and everything goes through them.