iCloud was compromised
I got a call saying my iCloud was compromised. How do I confirm this?
Apple does not make such calls.
All such calls are scams from criminals attempting to steal your personal and financial information. The callers will often use number spoofing to pretend they are calling from a legitimate business. The correct course of action is to ignore the calls or hang up on them, repeatedly if needed.
Recognize and avoid phishing messages, phony support calls, and other scams - Apple Support