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As SeniorSitizen commented, TV cables are not utilities, so if you can't get a response from Xfinity, you're likely on your own. Barring any obstacles in the way, they tend to run those as straight as they can, so if you can find one end, and dig up a few feet of it, you'll likely have a pretty good idea where it goes.

Your other option is to call Xfinity and tell them you want to cancel your service and go with another provider, because you're expecting to destroy the line, anyway. I'll bet that would get their attention.
 
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