1. How many games have you played
You should play at least 60 games before complaining about promotion.
2. What are your win rates.
When you post your complaint always state your win rates against each league.
If you want to get promoted your win rates should look something like
vs league you are in: ~60%
vs league above you: ~50%
vs league 2 above you: ~40%
3. Your rank and level are irrelevant to matchmaking
4. Dont use all caps.