Hi @user1319
While Shopify’s official policy is no refunds, your best option is to contact their support and politely ask for a one-time exception due to the genuine mistake and lack of store activity.
To reach them, go to the help center’s contact page and tell the chatbot “requesting a refund for an unused store” to get past it and connect with a human. When you speak with them, calmly explain the situation.
Most importantly, ask for help logging in so you can immediately go to Settings → Plan to properly deactivate your store and prevent all future charges.
Hope this helps!