Proton
Empowering you to choose a better internet where privacy is the default. Protect yourself online with Proton Mail, Proton VPN, Proton Calendar, Proton Drive. Proton Pass and SimpleLogin.
Proton Mail is the world's largest secure email provider. Swiss, end-to-end encrypted, private, and free.
Proton VPN is the world’s only open-source, publicly audited, unlimited and free VPN. Swiss-based, no-ads, and no-logs.
Proton Calendar is the world's first end-to-end encrypted calendar that allows you to keep your life private.
Proton Drive is a free end-to-end encrypted cloud storage that allows you to securely backup and share your files. It's open source, publicly audited, and Swiss-based.
Proton Pass Proton Pass is a free and open-source password manager which brings a higher level of security with rigorous end-to-end encryption of all data (including usernames, URLs, notes, and more) and email alias support.
SimpleLogin lets you send and receive emails anonymously via easily-generated unique email aliases.
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https://proton.me/support/contact
They don't have a general support email, just open a ticket and one of the support agents will get in contact soon
Also on that page:
If you would prefer to contact us without using this form, you can email us at support@protonmail.zendesk.com.
thank you for the e-mail, I tried again and could not find that piece of text on thr page
For me it was displayed in an info box underneath the form that was linked by the above user. It might depend on region or some other factor, but as per the other comment it is best to use the form as the email can have a slow response.