How to increase your RP-(Demolition) in the Match Channels.
This is a bug and they will most likely reset it soon.
Only works in the Match Channels as far as I know.
1. Play match in EU or NA Championship
2. Leave the room and then go to the lobby
3. Re-join the game
4. Repeat - repeat - repeat
Your RP points will increase and you will get one level for about every 4-5 room leaves.
Voila... Silver Star RP Demolition rank in one day
You may see it right away or when you re-log.