I see you're in Canada, I am as well. Unfortunately for us, XM in Canada is a HUGE PAIN to deal with.
Did you only get a 3 week trial? You're supposed to get 6 months....... Hence why my issues with XM started - They deactivated my radio after 3 months - when the Lexus information AND the XM Canada website clearly state that Lexus vehicles have a 6 month free trial in Canada. I think the people in the call centre don't know what to do, they just follow a script - every time they get to a "dead end" trying to help you, the default answer is "contact your dealer"
After multiple calls with my salesperson and his XM rep, we finally got the radio hooked back up, but then the sound quality was crap.
The 6 month trial has finally expired for me and I haven't called XM to activate the full subscription.
They did the multiple refresh on my radio as well, when the sound quality was bad - it never worked, never activated - the dealer had to get his XM rep to activate it (although the sound issue was never rectified.
My advice - save yourself the aggravation and call your dealer - or just forget about XM altogether and just hook up your ipod.