Is there a way to report somebody in this game?

[Jomel Dimasuay]

I could understand one mistake for supporting the wrong team, but two?
If this person is in the same league as you, maybe he is friends with other league teams as well and supports whom he likes better.
Or maybe you defeeated his team in the past and now he's taking some kind of weird revenge?

in the beginning we were in the top 3 fighting for the chance at #1. Even before we played our first match vs each other, I guess they saw me watching a match so they requested me because I'm an active player. I beat the person in our first matchup and since then they've dropped points and I'm 8pts clear ahead of them. I guess you could call it revenge.

[Anna Martyniec]

in the beginning we were in the top 3 fighting for the chance at #1. Even before we played our first match vs each other, I guess they saw me watching a match so they requested me because I'm an active player. I beat the person in our first matchup and since then they've dropped points and I'm 8pts clear ahead of them. I guess you could call it revenge.

Just ignore the guy until the end of the season and if you end up in different leagues next season he should give you a rest.
Meanwhile, every time you see an invitation from him, think just how much this guy envies you, how brilliant your team is