Tim,
I would take it to Mitsubishi Canada. The office is on Matheson east of Dixie.
I've gone to 401 dixie dealer and they're pretty good. I've got an intake and my car is lowered and I've never had issues with them. If they're giving you the run around, I'd take it to the next level as they're image being tarnished isn't work a few thousand $$.

Good luck.