After that round, in which they did almost nothing to help there team, they proceeded to troll a clan-mate of their's, who did report them for teamwouding.
You're just mad because they had a better KDR then you, even with the negative scores. They were dicking around between clanmates, that's it. It impacted noone but themselves. I reported them for the lulz, not because I was offended.
tl;dr They weren't your teamwounds, fuck off.