The Need for Transparency in Competitive Progression

I recently won five games and lost four, but did not receive a promotion or demotion in Overwatch. Could you kindly provide more insight into why I wasn’t promoted or demoted and what exact numbers of wins/loses are required for me to progress? It would be greatly appreciated if you could offer more transparency and clarity regarding the competitive progression system, so that players like myself can better understand how to advance in the game. The current uncertainty and frustration associated with crossing our fingers after finishing five placement matches is not a pleasant experience. Thank you for your attention to this matter.