Thanks everyone for the wait. We have recovered free server and it's now working with full capacity.
[IMPORTANT NOTE] Any users, which have used ssh keys, should re-attach those via xPanel. Simply detach current ssh key, and attach it again. Also if you can't connect on free server, use some of these hostnames: ca1.shell.xshellz.com or ca2.shell.xshellz.com or ca3.shell.xshellz.com.
The system was reinstalled and key changed, so update it on your side, mostly in known_hosts file.