Fake phishingnposts.
i have two phone calls today claiming to be Apple representatives. They informed me that my ICLoud has been violated. I gave them no unfortunately.
Mac Pro
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They are unfortunately common. 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: https://support.apple.com/en-us/HT204759
Also, the caller id number shown on scam and marketing calls is frequently not the number actually originating the call. The number is often spoofed.
One option to consider is Settings > Phone > Silence Unknown Callers. See: https://support.apple.com/en-us/HT207099