Refund
There was a purchase made from my iStore account for Excel but I did not authorize payment. I didn't subscribe. I want a refund
MacBook Pro 13″, macOS 11.6
You can request a refund by following the steps in this guide:
Request a refund for apps or content that you bought from Apple - Apple Support
You are not guaranteed a refund tough.
This is an automated process, if you wish to explain your situation in-depth to a person you can:
Contact Apple for support and service - Apple Support
Also, see this:
How long refunds from the App Store or other Apple services take - Apple Support
Good luck!