I just got matched against a gm duo in qm

How is this possible? After the match I had to check their profiles because they played so insane. One was Artanis the other was Illidan, they were stomping is without us being even able to touch their forts, we didn't even get 5 kills the whole game (they got 30+). I checked my teammates and they were high silver-low diamond. Another one of the enemies was master too (playing Kael'thas). How is this fair? I know that when I play qm that I shouldn't expect quality but damn...

Edit: They were bming us too, dragging out the game for about 10 minutes too, it was really frustrating and shortly before they ended they would just stand infront of your spawn and taunt for 2 minutes straight.