They all do post this but it's mostly just on the surface, just as people do manage to cancel orders and get refunds from Bitmain, as you can see they agreed to send back the funds to the original wallet, so they agree on a refund but with their conditions.
Well that sucks, even if Bitmain is operating like that and I would never personally buy from such company. Why not mentioning that in TOS, that money can be refunded only to the address from where bitcoin is sent?
It's just stupid at this point of course they could make an exception especially since OP is having a meltdown and is probably one inch away from a heart attack but at the same time, you just can't just send funds to a different wallet that easily, especially since the buyer changed his mind a few hours after the order. What if he used somebody else account and coins to pay?
Yeah of course that they can't refund him immediately (not even Amazon would do that and we all know how good their customer support is) and OP really misbehaved (even his story of having Leger dying just few hours after sending money seems kinda far fetched) but imho there should be some procedure to get a refund to a different address.