I accidentally purchased an annual…Refund denied despite immediate request and no credits used

I accidentally purchased an annual ImagineArt subscription and contacted support immediately after the purchase. I have not used any credits or generated anything. My initial refund request was denied because accidental purchases are excluded from the refund policy. I then requested a senior review and explained again that I had contacted support immediately and had not used the service. After the senior review, I was still denied a full refund. I was offered a downgrade to a 3-month plan plus a refund of 50% of the difference between the annual and quarterly prices. I appreciate that support took the time to review my case, but this offer would still leave me paying a significant amount for a service I never intended to purchase and have not used. I hope ImagineArt will reconsider and provide a full refund, as they have done in some other cases involving prompt accidental purchases with no usage.