Here there are two options: you can call in a contractor, or if your handy with tools you can fix this yourself fairly easily. For the first call Roto-Rooter. To fix it find the leak, shut off your water. Then cur the pipe with a saw, and place two coupleing (on on each side of the space) and place a properly measured peice of pipe of the same type in its place. Cememnt in place.