I would be frustrated too. Do you have a Mitsubishi dealer local that it could live at until it is straight?
I wanted to mention that the way roads are paved, there's a 2° road slope (I think it is 2° without looking it back up again) for 2 lane roads. 2° sloped away from the center. So between the RH lane and the oncoming lane, there is 4° total difference. This is the target anyway.
Of course it is for water drainage. I think there's an exception to road slope in left hand turns. Then as I recall, the whole road (both lanes) are sloped 2° or greater to the inside of the turn for a) water drainage, and b) to promote positive steering.
Once an interstate gets to 3 lanes going in one direction, the fast and middle lanes are sloped at 2° and the outside (slow) lane is sloped at 4°.
Some of that is beside the point, but anywho, the point is, a bit of pull to the right is normal ... due to road slope. Just a bit. However, your situation seems altogether different, and not related to road slope.
I don't know if your steering wheel is off to the right because it is pulling to the left, or if it is tracking straight but perhaps the thrust angle is back out of spec again.
In any event, I can imagine your frustration, and hope you get it corrected...
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View my fuel log 2020 Mirage ES 1.2 manual: 42.4 mpg (US) ... 18.0 km/L ... 5.6 L/100 km ... 50.9 mpg (Imp)