repair after no-fault incident is triggering new alert but neither the shop or insurance will cover it.

our car's front side corner was hit by a car and it needed to be replaced.

the driver's insurance is geico and we agreed to use local shop that accepts their claims.

part of the repair process is to remove the front bumper and it has little crack.

well after the repair, the front sensor is going off and it seems to be re-calibrated or adjusted.

according to the shop the sensor malfunction is something that has existed before. that it is due to the crack and will not do any work.

i called the geico office and they said the same thing and won't cover for sensor calibration.

the crack is something that happened about two years ago by pushing the car little too far up in a garage and pressing against a shelf. no "collision" or significant impact. we never had any alert or code related to the sensor. not even when we took it to official dealer shop for maintenance.

what can we do about this situation?