Another thread had the same problem. The following response from a COX Support moderator did not work for me (the option "Reminder Options" was not there when I pressed the INFO button from within the GUIDE while I was on the station the reminder sent me to).
I get the impression the reminder is more linked to the team (Pittsburgh Penguins) than the channel
Also this other thread appears to be LOCKED despite the fact that it also appears to be UNRESOLVED
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Press the Guide button and go to the channel that is airing the MLB game. Once you're on the game channel, while still in the guide, press the Info button. This should give you the option for 'Reminder Options'. Select this option and this will allow you to modify your reminder options, which includes canceling the reminder. Please let us know if this helps.
Renee G.
Cox Support Forum Moderator