The only thing more annoying than voice notes are people who answer their phone when you call them to tell you that they can't speak now. I mean, just don't answer the damn phone if you can't speak now. There's no need to answer the call just to tell the person you can't speak now. Your lack of accepting the call tells me you can't speak now. People really have forgotten good old fashioned phone etiquette.
When I don't answer, some catch a fit and blow up every other contact medium. If they call from a cellphone atleast I can reply with a pre-set text that I'm in a meeting.