Game corruption

A very tough team in my league that stole points to everyone has decided to rage quit and tank with 3 rounds to go, just because he lost an important game (his fault), so tomorrow my opponent in the race for the title, unlike in the other 23 matches, will have a 10-0 walkthrough and win the league on goals.

When this happens in real life, all past games from a quitting team are voided 3-0.

But here there are no rules and if I denounce this situation I will get what everyone gets, right?... Scripted robot messages pretending to be human?