Steering not centered

Hi Peeps..
I noticed theres quite a few topics on steering wheel not centered issue but dont see much resolutions. Im facing the same issue with my 2013 Prius C. Steering was all fine until I got new tires put on with wheel alignment during a service at Toyota. I took it back and they worked on the car for like 2 days, adjust and couldnt find a way to straighten it. They said if its really bothering you (which it is) they need to adjust sub frames and cambers etc which would take lot of hours. Any one had much progress sorting this issue out?