If you look from under the back and towards the front of the car, there are two long horizontal bars that run from the center of the rear subframe to the wheel knuckles. Volvo refers to these as stays and the inboard bolts are eccentric to adjust the rear toe. I believe it's possible to adjust cambe...

Replace whatever is broken and get a four wheel alignment. No need to worry about the camber bolt, I mention it as a matter of reference.