Last week, the delivery guy buzzed me. I went down (three stairs down) to the main door and asked for whom was the delivery. He said, "apartment 6". I told him I'm from apartment 3. He said, "I know, I needed you to open the main door so I could leave this box inside".
I asked him why he didn't ring apartment 3. He said he could not get through.
Today, the guy rang again. He said, "I have a delivery for apartment 6". I told him "this is apartment 3". He said "yes, I just need you to open the main door." I said I was busy and he should ring apartment 6. He rang again several times which I ignored.
Was IBU?