I'm pretty sure cointerra would welcome refunds with wide open arms.  They priced their products according to a $120 bitcoin economy, and are now building severely underpriced products to fill their orders.  For someone to demand a fiat refund would be incredible profit for them, because now they have an extra machine..
with a $1000 bitcoin price, these machines are the geese that lay the golden eggs. They don't want to let them go.