It's not necessarily the amount of cars you transfer... It's an autoban the ban you for gameplay that doesn't appear to be normal. Yes please press the "?" Button in game for assistance.
It'll take time. Less than 2 weeks I'd say. Stay patient. You would have been banned because you triggered an autoban. Basically you were doing something that wasn't considered normal gameplay.
I've only seen them given out a few times since the game was launched... They are very rare. They gave a bunch a way on Twitter a while back. There has also been codes coming from other "cie" gam…