iCloud account breach

The calls are not from Apple.

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. 

Avoid phishing emails, fake 'virus' alerts, phony support calls, and other scams - Apple Support

No, those calls are Phishing calls designed to steal your Apple ID credentials. Apple will never "cold call" a customer with that, or any other information. You can safely ignore the call/block the number.