Follow the threads on this, prime them with "people have had issues, here is an example you can reference "BMW TSARA case 2002635"...(unsure if they can) and on a saturday...my dealer had a call to US warehouse and a new XM antennae installed when they opened Tuesday.
I was polite, let them know that -everyone- is having this issue, it's pretty hot on the internet, and the replacement ant fixes it right up.