Former support tech here. Phone calls are not getting things done. Phone calls are usually telling someone else to do something. Information passed on phone calls is mostly lost as soon as the other side hangs up. I've had many 30-45 minute time wasters with clients when they called instead of thinking about what thy were trying to say and replying to their ticket. The phone kills the productivity of two or more people at once, so it's as bad as a meeting. Stop calling people and start finishing stuff.