Helicopters generally fly under visual flight rules (VFR), where they are not under the control of Air Traffic Control (ATC) resulting in ATC not controlling where the helicopter flies.
While some metropolitan areas have defined helicopter routes, many are voluntary and helicopter pilots can deviate from those routes.
You should contact the helicopter operator directly for information regarding the helicopter operations you are experiencing.
If you believe the helicopters were flying unsafely, then this is an issue for your local FAA Flight Standards District Office (FSDO).