Unhappy with service at Mecerdes Benz 92 Rivonia

I took my car in on 20 June 2019 for brake pads and for them refill the ad blue as the light came up. Two days before I discovered that the service light also warning came up to service my car in 2000kms so I had also asked to complete the service for me. My headrest on the front passage seat was also giving me issues and so I requested that it should also get checked out.

My service provider called me during the day letting me know that the service can not be done as of yet as it needs to 1500kms before or late by 1500kms.

When I fetched my car later that afternoon, I noticed that my front right wheel had a nail it it, which resulted in me having a flat tyre and seeking help. I called Mercedes benz to let them know and was advised by service advisor that he will call me back and it will get sorted. The service advisor never got back to me that day. I then realised that the front chair which I had requested them to check the headrest for me was also no longer working, I could not move(open) the chair anymore. I need to move or open the chair as my car is a two door and no doors at the back.

I then drove to Mercedes benz to complain and show them what issues I am experiencing. I also took the nail found in my tyre that left me stuck. And expressed my frustrations. My service advisor said to me that he will get it sorted and he will call me (same day 24 June 2019) to let me know when I can bring in my car for fixing. I still have not received a call from him and now this is inconveniencing me as I cannot even get my kids into the car as the chair cannot move. I have also noted this with customer care and lady on the 20 & 21 June 2019 also advised it will get sorted but to no avail.