Need manager help with new cable curial

I've had 2 techs come out, the second with a snake but no probes or tracers, and still nothing. He wants me to cut a 4 inch hole in my thick stucco with a "guess" of where the conduit should come out, yet when he ran a yellow snake in and wiggled it around I never heard it anywhere near my house.how can I get a proper tech with some serious tools out here to help me determine exactly where this thing comes into my house before I end up destroying the outside of my walls?