property damage during install, unable to close window

During the installation, tech cut the wire going into the basement and drilled through a window which will not close now due to the wire. It poses a safety and security issue as I cannot lock that window. It also provides a weather related issue that I cannot close the window and the holes are open around the wire. The original wire was left hanging on the side of the house. There was existing wire here for connection, why would they drill into a brand new window damaging it and creating a security risk? I need it to be fixed immediately. Who can I contact about resolving this issue?