Make a copy of your correspondence and ask Paypal for a refund. Discover and Visa also have provisions for charge backs as well. At least get your money back and order it from someone else.
I certainly don't fault you for not wanting to deal with him again. I have only dealt with him twice but had no such problem. (Luckily for me.)
I am sorry to hear you are having problems with this vendor. As I stated when you posted originally, his communication falls significantly short of what we have come to expect from vendors in 2019, but English is not a language he is fluent in. That can lead to a lot of problems.
First, I am sure he is not a scammer. Given that SpiderNavy is a limited production line, he may be having a delay in acquiring another copy of the model and just has not adequately communicated the problem back to you.
I had a somewhat similar situation with Wiedling, a vendor of renown reputation. I had ordered a Neptun Nagara, but received the modernized sister ship model of Isuzu instead, which I already had. When I contacted him, he said he was out of stock on Nagara at that time, apologized for the mistake, and said he would send it to me when he received new stock and reimburse me for return shipping. I was to wait to send it back until I received the correct model. After 3 months, he still hadn't receive a replacement from Neptun, so he refunded the price of the Nagara with a note to keep the Isuzu at his expense. I still have the extra Isuzu in its mismarked box, if anyone is interested.
But that is how I would expect this problem to be resolved.
Back in June I asked about issues with LaWaLu Models. I have placed a multi-ship order which, when received, had the wrong model in it. I had written six times to him without result.
After posting my message, and writing again, he responded. He requested me to return the model he sent in error and then he would send me the model that I originally ordered and paid for. It cost me $14 to mail his model back. He acknowledged receiving it and said he would send the one he owed me (without paying for my shipping cost to cover his mistake). That was the last I heard from him. I have sent him another six messages without result.
Is this guy still alive, or is he a scammer? Since the model in question is the SpiderNavy Alexandra, it is not a minor issue ($110 model). Needless to say, others need to be careful ordering from this person. I will never do so again.