There's a lot of room for debate on that one.
Would GHash be taking money that belongs to the miners to pay back btcxchg?
Or would the miners be taking money that belongs to btcxchg if GHash pays them with these funds?
On the one hand you could say that once it is sent, it belongs to the receiver regardless of intent.
On the other hand, some could argue that an accidental payment to an unintended recipient carries a moral, ethical (and possibly? legal) requirement to return the payment to the sender.
In my case with GHash.IO, my transaction fee (about BTC2.6) was distributed to the miners immediately after hitting the block, so instead of retrieving that balance from the miners, which the support person I contacted said was impossible, he forwarded my case to a supervisor who was able to pay me back the fee from GHash.IO's own funds.
Good luck to you
Great!
How long it happened?
I made my own mistake on Dec. 9th, 2013. So not that long ago.
Ouch that was right before the peak too at a USD equivalent of 900 dollars!
Yeah, would have been a pretty large loss for me, lucky that GHash.IO was able to refund me.
To OP, just saying, it might take more than a week, because in my case, it had to be escalated from normal support to a supervisor who then had to contact the CFO. Be patient