the money already arrived in their bank, but my request has expired since yesterday,
then you can cancel the order with that price, and reimburse me with 6 coupons, or send him the difference, and they send me another S7
They won't do anything.
Sale is final when you put the order.
That's life and how business goes, deal with it....
Many of us lost much more this way....
(And i think this is not Bitmain's failure. You've accepted their terms when you put the order....)