We signed up for Grammarly for 1 year for my daughters MBA dissertation. A year later and after she graduated my credit card was billed again without prior email or announcement.
It's a business practice that is unacceptable. I reported it to AMEX as a fraudulent charge and was issued a new credit card.
There is no reachable customer service and all I have read here by Ann E. Are lies. This company is unwilling to return fraudulent changes and will just ignore you.
If they ever charged your card, replace that card because otherwise they will charge you forever.