After modem replaced by tech today he is unable to get cable card working on TIVO unit , need someone who still has knowledge of cable card

I had tech come out today because 2 days ago I changed my internet and tv program, before I made change both my internet and tivo box were working fine. I was told by online support there was a signal issue and had to have someone to come out. today they came out and found defective modem but signal was good. Long story short my internet is back up and running but my tv is not because tech had no knowledge of cable cards and neither did his supervisor. What I need is a person in elevated support who knows how to authorize my cable card again since it was fine 2 days ago. If I did not have so much money invested in the Tivo I would not care and get a x1  box , since I had a similar issue a year ago and the tech knew someone to call about it I'm hoping there are some of these people still around who might see this message and can get me going again .