I am very glad to inform you that GHash.IO are very good guys and have refund me the 2.8 btc.
This is the CEX.IO support answer:
I'm glad to inform you that your issue has been successfully resolved.
Please provide us with your BTC wallet address and we'll send you your funds.
I'll be waiting for your reply. Thank you for your request.
You can look the refund in the same address from where it was the sent
https://blockchain.info/address/1MtGNGScWBTT4SVi2rKf9v9846PmYd57Qv
Thanks a lot to all for your support!
So cool you got your coin back. Not only did you learn a big lesson, anyone that has read this thread will be more careful and double check all fields.
Congrats!