I am currently working in a night shift for a production support project and we generally have to mail users and app managers for random approvals through mails. And who tf in their sane mind would believe spamming is a good option. That dude called me at 4.30am in the morning and started saying aggressively that “yOu wIlL leArN liKe ThIs”. I said “stop bugging me” and cut the call. Just because cursing isn't permitted here that dude left without harm. Maybe I couldn't have scarred him enough as I tend to be the nice guy, but surely that doesn't mean I'll listen to anyone BS.