Harassment flags this number immediately. Repeated calls like 15 in a row from a private line, switching to this one for more, scream unwanted persistence. Block it without hesitation to stop the barrage. If it continues across numbers, report to your carrier or authorities—could be a stalker or automated spam bot. Enable call screening on your phone to filter unknowns. Don't engage or answer; that often encourages more. Stay vigilant, as patterns like this rarely stop on their own.
I received 15 successive calls on a private line, after which the caller switched to this number and rang another five times.