I'm not confused about anything, so I don't have to reread it. I'm going to give him the difference between the amount he should've paid versus what I charged him. So if he thinks he should've paid 20$, i'll send him 15$ back. I'm not trying to make a dam profit
The upgrade doesn't effect the PS3 resell slots, it adds an extra slot for the PS4. I didn't contact him, because it wouldn't have a negative impact on his games.