Did you use your words and say 'hey, Pharah, I'm not sure it's working. Could you switch since they're running two characters that hard counter you?'
I swear to God half of you antisocial chuckle fucks say nothing but spew vitriol after a match is over. Yes, sometimes people can be stubborn and stupid. Yes, a lot of the time they will refuse to switch even if asked nicely. But very, very often a person, if nicely asked, WILL switch. I can't tell you the amount of times I've asked someone to switch due to being countered only to have them go 'Oh, yeah, you're right'.
A second voice breaks them out of the cycle and makes them realize they're throwing themselves against a wall.