It's possible this dealership service department has never heard of a Mirage with a defective rear axle. A few years ago, this was a moderately common issue (maybe upwards of 10% of 2014-2015 Mirages seemed to have a bad rear axle). The problem seems to be much more unusual with the later model Mirages.
Originally Posted by 2017G4guy
The service manager at this dealership needs to call the Mitsubishi Tech Line to report the problem and open a case. Mitsubishi is well aware of the problem and (hopefully) they can set these guys straight. Check out THIS thread and be sure to read the answer to question #27.
If you have any alignment numbers, post them...or post a picture of your alignment sheet if you have one.
The only fix for a rear axle with an alignment problem is to replace the rear axle assembly. If this part is on some sort of national backorder, maybe this is why they are dragging their feet on the repair?
View my fuel log 2015 Mirage ES 1.2 manual: 52.2 mpg (US) ... 22.2 km/L ... 4.5 L/100 km ... 62.6 mpg (Imp)