Sewer line stopped up

Both of my bathrooms recently flooded after turning on my shower. I called a plumber and when he came he ran a camera and determined that Comcast had drilled through the sewer line while installing fiber optic cable. I called the city utility department to come look who confirmed it was a Comcast. They informed me to contact Comcast. I called and when I FINALLY got to speak to a person they told me they couldn’t help since I wasn’t a customer and that I needed to drive to the nearest Comcast/infinity store and get them to help. When I arrived at the store they weren’t sure how to help and just entered a ticket on the computer. Not sure why the guy on the phone couldn’t do this. I have two small children and have been without water for two days now. This is unacceptable. I need someone from Comcast to reach out immediately.