Grammarly Premium Tricked Me Into Paying $144 Instead of $12

I signed up for Grammarly Premium, thinking I was paying a one-time monthly fee of $12, as clearly shown in the app. But the moment I entered my payment details, Grammarly charged me $144 for an entire year! This was never made clear, and now, despite canceling my subscription immediately, they are refusing to issue a refund. This feels like a scam! If I had known it was an annual charge, I never would have subscribed. Grammarly, fix this! Refund my money! Has anyone else been tricked like this? This is misleading and unacceptable, and I won’t stop until I get my refund!