If there's proof of scheduling at 3PM, which he said he had, then he does not have to wait beyond 15 min before getting the activity win. His screenshot shows you still didn't accept by 3:16PM. That said, I can't tell where or if 3PM was agreed on to be honest. Also, I was not made aware of the match already being decided when he talked to me. I'm going to ask a TD to resolve this and see if I can get someone who speaks Spanish to confirm whether or not a scheduled time was actually made.
Update: So apparently there was no specific scheduled time. teres gave a 3 hour range and when El asked for a specific time, he did not reply. I do not know why El assumed there was a scheduled time at 3PM. I'm going to wait for a TD to decide this.