i am stymmied
After many attempts I am unable to cancel Duolingo plus. That, and I never did get any free time... two days in I saw a 79 dollar charge against my Apple account and I don't have any way to contact them to even get my money back. So much for fun and free.
Have you already tried this help text in the English Duolingo Help Center
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you have a purchase issue or an issue related to Duolingo Plus, please select "Purchase Issue" from the dropdown on the form.