When you take money in once currency and pay back in a devalued one that's called an arbitrage scam.
If you want your BTC back kindly remind them of the Mail & Wire Fraud laws.
http://en.wikipedia.org/wiki/Mail_and_wire_fraudIf you paid in BTC, there's no excuse for them not paying back in BTC, they run a huge mining farm and pool so they have freshly mined BTC every day!
This is incredible! Quick find a lawyer and sue every major credit card company in the world! If I buy something with USD on my CC that is priced in GBP, and then the USD/GBP changes when I ask for a refund, I get refunded the USD equivalent of what the product costs in GBP. But you gave a link that says nothing about this, so therefore you are right!
So a US company, that prices products in US dollars, and accepts other currency for the convenience of the customer (valued at the USD exchange rate) can be compelled - by a US court - to pay damages/restitution valued in another currency? (rhetorical questions, the answer is of course not - claiming such is true is an arbitrage scam)
BFL is a mess, but this is not one of the reasons why.
EDIT: throwing in that "huge mining farm" comment is awesome. So BFL went from being a scam with no products, incompetent and unable to put together a single ASIC on a board, to running a secret massive mining farm. Pick one or the other: does BFL not have any ASICs, or they do and they are secretly mining with them? You can't have both.