Cut the cable. See whose truck shows up to repair it.
HA! I threatened to do exactly that years ago and boy did it get a response.
Neighbor had his sewer clog, and they couldn't cut through the obstruction. So, they start digging up the line right outside our shared back fence.
Get down to his line and they find some sort of cable drilled right through the center of it. The only lines running underground back there were, at the time, phone and cable TV (and cable TV was LOT shallower). Electric was also running back there, but this was obviously NOT an electrical line.
Verizon (phone company) sends some people out and they're hemming and hawing over well, we're not really sure that it's our line, we don't think we're responsible for it, we don't have any record of it.... Just basically trying to make the homeowner eat the bill.
It's August, it's hotter than hell and unbelievably humid, and there's a open, leaking, stinking sewer in our back yards.
I went inside, got my big bolt cutters, and said "well, if it's not your line, it must be abandoned, so let's just cut it and get it out of the way."
The Verizon guys weren't too happy with that... but I don't understand, if it's not your line, then it's no big deal to you, right? Yeah, it was their line, it was a live telephone line, and they KNEW it was their line.
They took responsibility for it. Ended up costing them something like $17,000.