When you purchase a domain or product from GoDaddy, it's clearly outlined during the purchase that your product or domain will be set to auto-renew unless you go into the account settings and change it. You have to agree to that before you can make the purchase if I'm not mistaken.
It's possible you can call into phone support and speak with them about it. Depending on when it last auto-renewed, you may be able to get a refund on the current year's renewal.
Good luck and always read the fine print!
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