Sewer line replaced, now freshwater leak??

[Rivy S.]

I have a rental property here in DFW that had sewer backups several times in a row about 6 months ago.  I had a plumber camera the line and it was completely corroded (this was 2 months after I bought it).  I coughed up 14k to replace the entire sewer line. Since the day that the replacement was done, the tenant says there's one spot in the tile that is constantly wet, as well as an area on the outside of the  house.  So it sounds to me like the plumbers who replaced the sewer line damaged the fresh water line.  Is that even possible? If so, can I make them fix it? Or am I going to have to tunnel under the house again, and spend another 14k fixing this??