Tim, you've posted this on many threads. Please don't spam this board with the same request all around. You have your own thread and we can deal with it here.
This sounds like a case where you need to request a lineup change to add 999 to your channels. Here is the form to do that:
Second, in the meantime, a workaround would be to set the TiVo to any channel you like, pull out the cable box remote, and tune the cable box to channel 999, then use the cable box remote to order whatever you want to watch. Sure, TiVo will still think its on the old channel, and the recording name will be wrong if you record it, but you will get your programming through the TiVo just the same.