Mark acts like a god

I phoned in to head office to speak to Marks manager. Mark thinks its his given right to speak over me while I am talking meaning I dont hear what he is saying and he doesnt hear what I am saying. Only goats from a farm bleat whenever they want to. He then proceeds to start screaming at me over the phone. Not talking loudly but screaming. What an ass. 2 Hellopeters about Mark from one customer isnt great