Contact support: https://helpcenter.netcup.com/en/support
At the bottom of the page, there is Emergency Support if you need the server right now and believe that the error is not your fault.
I did this yesterday and my problem is still not solved. 
Beiträge von 0xamierr
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Hi, my server has no internet connection, pings say's destination unreachable and no packages are installed
There is no connection even in rescue mode
What to do