*********** Calling Staff - Rude to client - doesn't understand, please call back later

Worst Call Centre experience probably Ever, Guy phones and asks to speak with x and y, after asking in regards to what, unable to answer, as I was in an open plan, asked him to call me later as I can't determine the sensitivity of the conversation I'm about to have... this is how it goes: MBD: hi is this ****** yyyy Me: who is this MBD: Im phoning from MBD Me: in regards to MBD: Confirm who this is Me: please phone back later MBD: What don't you understand Me: please phone back later MBD: You're speaking softly Me:(louder) rather phone back later MBD: Why are you making this difficult Me: (definitely audible) I cannot talk right now, please call later MBD: why are you going on like this, you are just making it difficult Me: what don't you understand about I can't talk right now MBD: excuse me Me: You're excused (hangs up)