My experience in dealing with a Chinese supplier was that the person you end up contacting doesn't want to upset you,but even more,doesn't want to upset the Boss so tells you bullshit to get you off his back.
And this was a firm that we already had a business relationship with.
I agree, with them this is the most common deal condition ... at best
Anyway, for common people buying expensive & delicate things abroad should be the last resort, almost all Ebay's oriental sellers are buy & die, the OP did all the possible nub's standard errors, including the scope's choice (most of Hantek's good are actually crap even if cheap) and there is still room for worsening.
If the courier's custom office decide to ask for real payment receipt proof, as often it happens when things become stressed or suspicious, this whole matter would turn in a much more unpleseant way.
As already sais here, it's still possible that the parcel takes its back route to china while the CC chargeback fails or simply that it results DOA after accepting it, becoming an expensive paperweight with the option to return it to an upset chinese seller.
I cannot see anything worse ;-)
If i buy something abroad it has to be a lot cheaper than local supplier, as it was with my first Rigol's scope (DS1022CD), paid less than one half than EU sellers ( tens years ago) despite huge import taxes (about 33%, including DHL shameless charges).
Lately i stopped to buy things even from more trusted US seller for the simple reason that shipping & custom cost have increased disproportionately over the years, you cannot count simply on VAT and extra UE import fee ( 22% and 5%), custom office invoices often contains additional unexplainable markups and considering that everything come from US, regardless cost & size, fell under the relentless and ferocious care of customs, the game is almost over.
With china sellers at least shipping cost are dirty cheap with registered signed for postal service, and we usually dodge custom fees if the parcel is small in size and the declared value is under 20-30 USD, as usually happen to be, while with couriers there is no escape.
To finalize, that distressing moan for 16£ is simply ridiculous, it would be the last of the problems if we consider all the possible, above mentioned, issues.
So dear OP, if you are *real* as i think, go out and pay the heavily discounted custom fee and try to learn something from all what the previous wise and experienced posters patiently told you.