Why was I charged for unknown purchase?

But did you really get charged? Do you see an actual charge on your credit card statement?

It's a very common scam to get an email or message saying you were charged by Apple for software you never purchased. The scam is to get you to click on a link to a fake Apple site, or to call a scammer's phone number to "remove" the charge. The entire goal of which is to get your credit card information.

Do you have Spectrum as your Internet/Mobile/TV provider?

Where did you see this charge?