You were definitely not meant to have it.
ON another thread this just this morning, you said something about if it was only 50% off, which had me puzzled because I knew it was on 50% off sale.
I went and checked and sure enough it was still 50% off.
I should have said something, but it would have been sarcastic so I refrained.. and now a few hours later it is no longer 50%.
Maybe email support and ask them nicely.. seems you just missed it by hours.