I agree, you should pay the customs and pick up your scope... even if you don't want it.
Rather than deal with a seller in HK who you already do not trust, take the bird in hand. And then sell it if you want your money back.
I'm reminded of a defective computer I purchased from a big box store. I finally took it back just a few days after the return policy expired. They had it for over a month, always with an update on what state it was in, where it was shipping off to, etc.
So I came down to the store in person to see if I could grease some wheels. And a rep informed me they were working on it in the back, as we spoke (hoya! I was totally shocked to hear this, because for the past 5 weeks whenever I had called, it had always been on a truck going nowhere). But that is still wasn't fixed, and they would call me when it was done (which was an empty song and dance that I was treated to at least once, already. Still I'm thilled to just have the computer back). I said no thanks. Kindly keep my money and give me the thing which I had paid for two months ago. Broken, in pieces, I don't care. Just give me all the parts in a bag, and I'll be on my way. No problem. I was done wasting my time, and I just wanted to cut my losses.
Well, apparently they didn't even have my computer. The look of distress on his face told me I had called a bluff. He scuttled away to speak to a manager, who came over to offer me a new replacement.
Point being, if it's there, I'd take it. You send it back, they have your money and you have nothing. And if you want a scope, you might like it. I have a Hantek. I bought it on Ebay. I like it. And I have received support from Hantek.