Hi Leander,
You are/(were) using a custom child theme to handle your two different menu outputs. That needs to be active for the menu’s to work.
The way to look into this is to use an FTP to change the code, ask your hosting provider for the details. Post them here and we can help you, there is no need for you to use a rude tone within the forum as we are here to help you.
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1. It is not our responsibility to manage your modifications, this is up to you.
2.
support does not help me to get my website working (since october 2016!
– looking at your past history, this is clearly not true.
Thanks.