
The system needs restructuring, completely. From the tangled phone lines, to the management that cares more about numbers than the people supplying those numbers. Rip it all out, start anew.
The managerial team can knock off the passive-aggressive attitudes they all have. They can also be more active in assisting with calls, instead of sitting back and ignoring requests they are supposed to be handling. They will also lie to you about putting in time off for you.