I got matched with 4 people that i had blocked...

I played normal blinds with a 4 premade that hit on me ( i was playing supp) when match started to go badly. I just muted them and played my game. I blocked them after match. The problem comes when i queue again and i get matched with the same 4 premade, i had them all blocked so i couldn't see what roles were they calling. I couldn't dodge at risk of getting leaverbuster so i picked a champ based on what champions / summoner spells they picked... Then i got into the game and guess what? I picked GP thinking i was top but they made me go support and threatened to report me (AGAIN). Why do you get matched with people that you block? Can Riot do something about this?
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