Disappointing & Lack of Quality Service

I took my car for a service on Thursday, 26th March. On the Monday, 23rd March, I spoke to Andries and indicated to him that the passenger seatbelt arm is not working and it needs to be fixed. I took my car to this same branch in 2013, and reported the seatbelt arm issue. They told me they will get authorisation from HO and will notify me whent to bring the car back in so that they can sort it out. They never did! When I called on Monday, 23rd March to make the booking, I stressed that they need to obtain authorisation to fix the seatbelt arn, Andries said he made a note and they will. When I dropped the car off on Thirsday for the service, I stressed this again and was assured they will fix it. I was told I can come anytime after 16:30 to pick up the car. I arrived at BMW only to be told the car was not ready and they did not fix the seatbelt arm. They needed to get authorisation first. I was really annoyed and only left BMW around 17:45 with my car. The car has not been properly serviced as it does not idle silently like it used to and I still have not heard back from them regarding the fixing of the seatbelt arm. Is this what they call service!