Controversial game endings

I'm going to describe 3 games I played in real life that ended in controversial circumstances. (All in this year, btw) 1. My opponent was in time trouble, but was winning. I kept checking his clock, and it seemed he still had time. So soon I resigned. But it turned out my opponent's time had ran out and his time gone to extra time. But as the clock doesn't beep and the extra time counts up, when I glanced at the clock (before resigning), I saw "+.30" meaning my opponent was timed out for 30 seconds, but I mistakenly thought he had 30 secs left. And as I said, I resigned. Arbiter's judgment: I lose 2. I was in time trouble, in a worse position. With me having only seconds left, my opponent pushed his pawn 2 spaces to promotion. I was stunned for a while, wanting to confirm he really made an illegal move. And in that short while, my clock went up. Before me making a claim for illegal move. My opponent wanted a win. Arbiter's judgment: Draw 3. I was in time trouble, but I was calm and traded off my opponent's pawns so he had only a King and Bishop. I had 2 pawns and a King. I felt comfortable that I would draw even if my time ran out, which it did, I let it. But then, my opponent insisted that he should win. His argument is that there is a checkmate position available, i.e. with me promoting a Knight and burying my King with said Knight in some corner so he could checkmate with King and Bishop. He argued with the arbiters for it and insisted they bring out a rulebook. Arbiter's judgment: Draw What do you guys think? Please give your opinion whether the right decisions were made.