Figma illegal and non-approved upgrade of monthly starter Plan to Annual Professional, while still charging monthly fees. How can this be fixed and the annual charge to be reimbursed?

I noticed that Figma in the last month secretly and illegally (without approval) upgraded my monthly starter Plan to Annual Professional, while still charging monthly fees for the upcoming month. How can this be fixed and the annual charge to be reimbursed?. I have submitted a ticket to the online portal, but no response. Any guidance would be appreciated. Thank you.