Stuck on B tier

Product: Need for Speed: Unbound
Platform:PC
Summarize your bug So basically what occurs is after changing body kit or anything the car gets stuck in B tier and cant change. I can't even finish the start mission, cuz they require A+ car.
How often does the bug occur? Every time (100%)
Steps: How can we find the bug ourselves? Change the car's body kit and ur stuck in B tier ez
What happens when the bug occurs? Can't do any races or anything.
What do you expect to see? A official fix to this finally so the ma eis playable.

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None of the fixes work. JUST DO AN OFFICIAL PATCH ALREADY.