Breach in my ICLOUD

It is a scam. Apple doesn't make unsolicited phone calls. If there was a problem you would be notified when attempting to log in, including when logging into this forum. Also see: Recognize and avoid phishing messages, phony support calls, and other scams - Apple Support

One option to consider is Settings > Phone > Silence Unknown Callers. See: Detect and block spam phone calls - Apple Support

Christinascribner Saids

“Breach in my ICLOUD: I keep getting calls from ‘apple support ‘ about my iCloud being breached[...]“

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Modify your Credentials:

Being this is a scam, if you provided personal information, and interacted with the message, then modify your credentials, ASAP:

• Modify: your login credentials (Using Both a New eMail and a New Password for each and all sites)
• Associate: a different method of payment to your account
• Enable: Two-Factor Authentication for Apple ID and for all other accounts that have such an applicable option