Forza 5 Cars purchased from Marketplace not in Garage

Just purchased several packs, like the Alpinestars car pack and the Hot Wheels car pack, and it said there would be a one-time addition of the cars to my garage…umm, hasn’t happened yet. Xbox live support says the developer has to fix the problem, so that’s why I’m here…who do I need to talk to? Anyone else having this problem?

You need to go buy the cars - first time they will cost ZERO credits.