I would like to dispute a charge for an…

I would like to dispute a charge for an annual subscription purchase made by mistake. I intended to purchase a monthly subscription, but I accidentally selected the annual plan. I contacted the company's support immediately after the purchase and requested a refund within their stated refund eligibility period. My usage was below the allowed refund limit mentioned in their own refund policy, and I also followed all instructions provided by their support team, including canceling the auto-renewal. Despite this, my refund request was denied. I am requesting a review of this transaction and possible charge reversal due to the accidental purchase and the circumstances explained above.