Accidentally cut an underground cable

Hello, I was gardening yesterday and dug up what I thought was a tree root and cut it, but it was a cable. My internet service is still fine and I have not heard any complaints from neighbors, so I'm not sure if it's a cable from another service provider or no longer in use. Please advise as soon as possible. Not sure why the cable was so close to the surface- it was only 3 or 4 inches deep, as opposed to the required 12-24 inches...