Duolingo Charged Me Without Notice After Trial – Demanding a Refund

I subscribed to the annual Super plan on Duolingo, but right after the trial period ended, I was charged without any notification or consent. The payment was taken automatically from my account without any prior feedback or authorization. I have just canceled the subscription and am requesting a full refund of the charge. If this issue is not resolved promptly, I will consider taking legal action. Please address this matter urgently and refund my payment. Thank you.