I have the exact same problem. We are DayZ.st customers too (2 servers currently), but unhappy with their(dayz.st) level of support and their servers. Trying to find a decent host and have (had?) our hopes up for Survival Servers.
Usually this registration/server ordering process is fully automated, so it's kind of strange that this system sent incorrect login/password combinations.
NOTE: dayztools and the phpmyadmin DO work. Just not the TCA login credentials to get the server started and setup.
Hope this gets resolved soon, because it has been 3 days now. Paid for the server, no server credentials, no login, no server, no game, no replies (to tickets, mails)..... just ... nothing.
Created a ticket with number: 953852