terrible service by the manager at Glasfit montana

i took my car in to get my windscreen replaced in glasfit montana. we did a security check and everything was ok. when they brought back the car, there was a light on, on the dashboard saying the car battery wasnt charging (the light wasnt on when i took the car in) i asked to speak to the manager and she didnt even want to hear what i had to say. she ended up shouting at me next to customers. not even suggesting that we move to her office, she said they are a windscreen place and she doesnt care if the light went on while the car was in their care