Hey there @Jadrankaa. I'm sorry to hear you ran into some toxic gameplay that ended up with you getting penalized.
You can definitely report behavior like this, either through the support website or on twitter. For this specific kind of thing I would recommend twitter! Follow the process explained here and make a tweet with your video attached. If the file ends up being too big to attach directly, you will need to upload it to YouTube and provide a link in your tweet instead. Note that you don't need to tag the support account in the tweet, just the hashtag shown here is...