I have been getting calls saying my I cloud account has been breach, what should I do

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

Ignore them. They're scams; Apple only contacts customers if they reach out first.

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You are quite welcome.