https://proton.me/support/contact?topic=Other
> If you would prefer to contact us without using this form, you can email us at support@protonmail.zendesk.com. You can visit this page for more options.
...those more options:
> You can still contact us directly
> All support requests are handled in-house by Proton, but if you have specific concerns and would like to keep your query within Proton Mail (that is, not using Zendesk), you can email us directly at contact@proton.me.
