Well, a lawsuit may not even be an option:

http://www.startribune.com/local/west/217255781.html

If your cows have sore feet, it is extremely likely that they get stray voltage directly from the ground, not just from corroding tubing in contact with the ground. I don't know where you have your earth ground contacts in the barn (assuming this is limited to the barn), but if they are inside the barn, try redirecting all your ground contacts outside with a very conductive copper cable. The stray voltage happens because the current used by your barn cannot travel back because the electricity company messed up the wiring on their side or something. Maybe several wires were melted together after a storm on these big poles and can't carry over all the return current. But by making the place less dangerous for the cows, you'd only make it more dangerous for you and your family. If a machine gets real faulty, it won't be just a few volts leaking, but a full scale electrocution.

Since the electricity company does not seem cooperative, why don't you go off-grid 100%? If you have cows, you have a permanent, sustainable and important source of methane. Add a generator, and you have electricity for all your needs. Just my 2 cents. More and more barns add methane "digesters" with a perpetual screw to introduce the mixed manure and any other organic material into the digester, a compressor, and another screw or the same to retrieve the "digested" manure, with slightly less humic value because of the carbon removed, but still a very valuable fertilizer.