Lack of accountability

Took my car for a windscreen replacement at the service provider that works with auto and General which is PG glass , realised while driving that the sensors of my car were affected and I took the car back on Monday and PG glass said the parts they ordered can take up to 21 days . I contacted auto and general as my insurer that the service provider that they referred me to will be taking long to fix my car and I’m desperate can’t move around around as it’s not safe to drive my car . Up to today I’m sent from one consultant to another. I was promised the manger will call me to see how I can be assisted but nothing. The service I’m getting is very terrible .