Cable Card Pairing

Called tech support on 10/05/26 to get my cable carded paired after swapping out the hard drive on my Tivo DVR  Spent 1/2 hour with the agent while he tried to help me but really didn't--he kept telling me that cable cards are retired; I need to go to a store, etc...  They are not retired--I have a cable card in a 2nd TiVo and it works just fine.  The TiVo in question worked just fine just a couple of  hours before the phone call.  I asked for a supervisor and got put on hold and left there on hold for 45 minutes!!!   I hung up.  All I need is to have my cable card paired with Comcast again--I give Comcast a few numbers from the TiVo screen--Comcast enters them and sends a signal...   Somebody in Comcast knows how to do this!!!!!