TiVo cablecard needs activation again after Seasonal Convenience Plan canceled

Once again I used the Seasonal Convenience Plan while I was gone on summer vacation.  I have now returned and canceled that plan, but my TiVo cablecard was apparently deactivated.  Now I cannot receive any television channels using my TiVo, and have been very frustrated trying to re-activate my cablecard.  Please help me get through to someone who can fix this.