What is this? Please review the matchmaking to avoid situations like this.
You made tier 6 you have to expect to meet players in that tier that are better than you.
It’s based on the number of trophies you have - the higher you climb, the more challenging PVP opponents you face. After loosing, you then loose trophies, meaning you go back down to face opponents of your level.
BUT, of course, having to loose several times and get back down to where you can finally get more rewards is not fun. Here’s my suggestion for how to make it a little less not-fun: