After buying a bmw the excitement kicks in. I did ...

After buying a bmw the excitement kicks in. I did not purchase my vehicle from this dealership but my used 550i was serviced at this dealership. After the check engine light has come on many times it was concluded that it is a cylinder 3 misfire. Looking into the service records, it was in the dealership for a recall on the exact same cylinder that is not good anymore and needs a new cylinder head due to the tech putting in the wrong screws to hold the head in. After my bmw dealership tried to speak with them reguarding this issue they literally said screw you not my issue. Every time I bring up this dealership to anyone corporate or at a dealership level everyone has basically told me that this dealership is known for service errors on vehicles. How you service your vehicles is your reputation as a car dealership after the sale to keep your customers happy and in the bmw family but you have changed my happiness into a nightmare all thanks to your service department.