Setting up Mullvad to run on Mobian

[Azathoth]

I have tried setting up Mullvad to run through OpenVPN (exactly how the site tells you to set up the VPN through OpenVPN in a terminal on Debian), and while nothing obviously goes wrong and my openvpn files seem to be in the right place, when I try to run sudo service openvpn start, nothing happens. Similarly nothing happens with the other command on Mullvad's website. I can't seem to import any sort of .ovpn or .conf file to the built in networking manager (it throws an unknown error), and any info I can find online about this is irrelevant, dead or unhelpful. Any help would be appreciated.