I lost a high school match 6-7(5) against a guy who I would easily beat. I was winning 4-0 and then when he started being cheap I just lost it. On the 1st few games there was a point where I was at the net and he hit a pass that just missed the line, I was 100% sure it was out by about 2cm. I called out and then guy though I was cheating so in the next few games, he started doing the same. On aces, he says I hit lets when I was pretty sure the ball didn't touch the net. We played with 3 balls, 2 balls new and one flat one. He hit a miss hit that lost one ball. We now have 2 balls, the flat one and a good one. When I recieve, I stand on the baseline and he serves the flat ball ON purpose and aces me. You can't really tell which ball is flat from across the other side. So I went up to my coach and asked him if I could have another ball. I swapped it with the flat one and the guy asks me "Why did you switch?". OMG, why the f*ck would you want to play with a flat ball? I can't believe I still lost the match and it cost us our team losing to their school. I want to ask you guys, what would you do if you were in my position? Or share your experience with something similar.