Your sod installers should have sodded over the line. The proper way to bury the line is to lift up the sod, put the coax under and replace the sod. There is no need to dig a trench for a piece of coax.
Hello Cinthel, I can assist you with getting your concerns addressed. First I will need a little more information to better assist you, can you please send me a private message with your full name, and account number by clicking on my name (ComcastAmir) and then "private message me"?