Whew, that is scary, Skuzzy. Amazing how some installations go awry.
In that vein (trench?), we've had a front gas lamp that has been turned off for years. With no plans to revive it, I got concerned when it began leaning a little bit.
I asked the gas company to disconnect it. Just before that, on another utility matter, all the buried lines in our yard (water, electric, telephone, gas, cable) were marked by another contractor.
The gas company crew dug where the other contractor said the gas line was. And dug. And dug some more. After a three-foot hole on one side of the driveway, the crew came over next to the lamp and found the gas lamp line was on a diagonal to the main line, not a perpendicular line as the other contractor had marked.
In spite of some specific exceptions, sometimes it's amazing how well things seem to work in general. Your story about your cable, though, is the one of the worst utility goofs I've ever heard. I hope some day it gets fixed and you can enjoy the benefits of a good cable system.