Our site is not able to access with a Sitelock notice

Hello,

Our site is not able to access with a Sitelock notice as below:
"nhadep.net
You've requested a page that currently is on the SiteLock network.
SiteLock was unable to connect to the server. "

Could you please help to check this issue? And how to fix it?
We could not even access Dashboard of Nhadep.net to see what happened now.
Thanks in advance,

Khanh