First day, I used contact link on CCP (https://www.customercontrolpanel.de/run/kontakt.php).
Second day, I created a ticket on support page (https://helpcenter.netcup.com/en/support).
Third day, I wrote an email to mail@netcup.de.
Today is fourth day. I haven't got answer from any of the channels.
Does netcup have support? How to contact them? They claim "If we receive your ticket before 5pm CET on german weekdays (Mon-Fri), we promise to respond to your request the same day."