SiriusXM used a collection agency to try to collect fees for service I never asked for or authorized Internet

My SiriusXM satellite radio subscription was to expire on 4/19/2012. SiriusXM sent me a notice that service would be turned off if I didn't send in payment.  This was fine with me since I haven't listened to SiriusXM for months.  I might have considered renewing, but they send out a note from EOS CCA demanding payment of a debt.  The letter was dated 4/19/2012, the same day as my paid subscription to SiriusXM was to expire.  They are basically threatening collection of debt for future services that I neither authorized or asked for.