16 barn finds no more after

Can you please help. I am having difficulties with FH3 downloading single cars (barn finds from no 16 onwards and n cars from the forzathons)
Can you please look into it. Microsoft help line said they cant fix it on their end. Told me to get in touch with turn 10 studio.
Have uninstalled and reinstalled all of forza 3. Still the same. Can not get a single car download.
[Mod Edit - email removed - MM]

Thanks Steve