Premades in Dynamic Queues ######broken

Okay, I writting this because I am tired of playing solo rank vs premades! I just had a game were we went vs a 3 man premade now you might not think its much but it really is when they are top mid and jg. It made the solo rank game unfair. They obviously won late game because they were so synchronized with one another. Why wont riot fix this . It honestly isnt right makes climbing the elo ladder so much more harder