Line burial request in a public area

I am not a Comcast customer, but I live near an area that has an exposed cable running along the ground and laid over a public walking path. The walking path is a high traffic area where children walk every day to school. It poses both a tripping hazard and potentially an electrical hazard. I know it is a Comcast cable because I saw the Comcast trucks working there earlier this summer and saw them running the cable. I assumed they would come back and bury it but never did. This was months ago. How can I request someone to come out and bury the line.