I usually stick twitch on or Spotify, get in a groove and knuckle down.

So I work in a school as a network manager and general admin, but it is commonly known I am a programmer too. Anywho, I got asked by a member of staff to find a way to add all teachers to the classrooms (we use Google classroom) and I wrote down what he asked. I spent my evening at home working on it and got it 50% done and finished at work the next day. This member of staff comes in and was happy, so I read back what he asked me for and he turns around and says "Oh, I wanted you to add all classrooms to one account, didn't I say that" I tried to explain he didn't but he chocked it up to me not listening. I even showed him the piece of paper on which I wrote down what he wanted but no, it turned into a shouting match and I told him to leave. I finished the script but I'm wondering if I should actually give it to him. What's your thoughts?