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Last I tried was with mullvad and it had a system wide Killswitch.
Maybe try turning off IPv6 if applicable.
Do you get specific letters about files you have downloaded, or generic letters about you using torrent?
If the first, something is wrong with your setup. Mullvad should be fine.
If the latter, it might be only your DNS setup is leaking and your isp sees the domains you are connecting to.
https://mullvad.net/en/help/dns-leaks/