Terrible/unacceptable service by Kilokor service centre

My car was using too much oil and I left it for repairs on the 30th of June at Kilokor with the promise that the job will be done in 2weeks but that ended up being more than a month. Though I was stranded with out a car for that long I decided to give them enough time. I got a call on the 1st August to come and collect the car and I went to pick it up yesterday 2nd August and to my surprise when I got home I find out that the Wheel arch liners are missing . I decided to check what more could be missing and found out that the engine cover underneath the car is also missing. Got at work this morning 2nd August and send them an email to report the problem and also called them and the manager promised to get back to me. I called them the whole day and still the answer is we will get back to you and I could tell that the issue is not on the priority list. My problem is what else could be missing on that vehicle that I am not aware of, I believe they do not have the check list to make sure everything is in order any how can you give a client the vehicle that has parts missing maybe hoping that I do not find out.

I am so disappointed on their service.