I was charged for something and I didn’t order or sign up for anything?

First make sure you were actually charged for something and you're not referring to a Phishing Scam (email or text). Have you checked your credit card directly to see there is an actual charge for something unauthorized?

Here are two links.

How to recognize Phishing Scams --> Recognize and avoid phishing messages, phony support calls, and other scams - Apple Support

If you see an actual charge you don't recognize --> If you see 'apple.com/bill' on your billing statement - Apple Support

See this Apple article: Billing and Subscriptions

https://support.apple.com/billing

View your puchase history,

Cancel your subscription,

Try to Request a refund.