Harassment from relentless silent calls, like 11 in just 20 minutes, points to automated harassment or nuisance tactics that waste your time and spike anxiety. Block the number immediately on your phone or via your carrier's tools to cut off the barrage. Enable spam filters in your call settings for extra protection, and report it to authorities if it persists—apps like Truecaller can help identify patterns too. Don't engage or call back; that often fuels more calls. Stay vigilant, as these can escalate to real threats if unchecked.
Repeated calls came in without any conversation, eleven times within twenty minutes.