I had a similar, but not as bad issue with the phone company. I was replacing a fence and didn't call
. Sure enough I hit electrical conduit right at the edge of the property line. So then I called.
Everyone came out except the phone company. Nobody else claimed the broken conduit. So 24 hours later, per the rules, I continued with my fence. I did squirt a little epoxy over the broken conduit, so maybe that fixed it. That was 10 years ago and last year the phone company had to dig in my backyard for something
.
You can still dig where they mark, you just have to dig with hand tools.