Refund request after cancellation of subscription

I have encountered a confusing situation regarding my subscription. On October 31st, I changed my plan from Pro to Standard and was billed for an annual subscription valid until October 31st, 2026.

However, on November 29th, I was charged an additional $844. Upon checking my account, I noticed that an extra Pro subscription had been added. I was neither asked to approve this nor notified about it.

On December 5th, I canceled the new Pro subscription and received a confirmation email stating that the canceled subscription will remain active until November 2026.

Since I do not need two subscriptions, I kindly request a full refund for the additional charge. I have also tried to resolve this issue using the available chatbot, but without success.

Thank you for your understanding and assistance. Please let me know if you need any further details from my side.