To start I am sorry you are a fellow fan with TWC they SUCK as far as getting games in HD
48 is MSG+ 748 is MSG+HD
27 is MSG 727 is MSG HD
122 is VS 481VS HD
If a game is on MSG+2 were out of luck for HD only on Reg def on channel 197 or 198 it is painful to watch
I call every game that is not in HD to complain but change yet.
I have TWC triple Play package (DTV) check if have this. Another issue you may have is you might not have a HD box if this is the case
simply take your box into a TWC location and swap it for a HD box free of charge and no additional monthly charge ether.
if you can watch say channel 702,704,705,707 this means you have a hd box being there just 2,4,5,7 in HD.