Retailer of dodgy Thunderbolt 3 hub doesn't wish to pay for the return postage of an unsuitable item. Neither do I. The postage was included in the original purchase price. Their counter offer is to allow me to keep the thing and offer a refund of 45% of the purchase. Fine by me. I'll donate or sell the offending thing to the Mac User Group as a raffle prize & alter the packaging to show it only supports USB 2·0.