swears at client

My geyser burst under warrantee and as per my insurance Kwikot send someone to replace my geyser. He didn't make an appointment so I told him it's fine I'll swop a few things around and rush home. While I'm driving he phones me and says he can't wait he's going to leave. I got upset and told he can't do that I'm around the corner and I changed my schedule to fit his. An argument arose then he called me a **** and slammed the phone in my era and left while I was arriving. You do not talk to clients like that! Worst service ever!!