Icloud
I was just called and told to contact Apple Support because my iCloud account had been breached. I figured it was a scam so I hung up the phone and I’m now contacting Apple Support myself.
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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