Hello the tech game,
I'm going to make a tutorial on how to get anything on Xbox live market place for free (short tutorial). So after you buy something don't download it. Wring the Microsoft call center thing and say you got an error saying "download error occurred" and say that it took your Microsoft points and then failed. They will probably give you your points back (if not just hang up and talk to someone else when you ring back). Ok so after that buy something else and just repeat the above thing again and enjoy free dlc, maps or whatever .