As said above, you need to report them on the reports site as this is the wrong place to report them. If you haven't made a reports site account before, then do /registerreports ingame and then you'll be able to make one ^-^When I saw this I thought that @Cynamooo made the suggestion, lol.
Anyways, in order to get those teamers banned report them at reports.cubecraft.net and a staff member will ban them :3