Report property damage

Comcast is upgrading the wiring in our commercial plaza. They cut and removed portions of the CAT6 wire that connects the Lumen OLT in the building's Telco room to our unit. Lumen sent out a technician who confirmed operation at the DMARC and observed the cut CAT6 cable on the building exterior.  I called the Comcast Project Manager at the number provided by the landlord and left a message, but have not received a call back.   How can I report the damage and get some help?  We've been without connectivity since Friday afternoon.