Missing carpet

I took in my car for service, the following day I discovered that one of the carpet was missing. I informed my service advisor. He promised to check with the car wash. He didn’t find the carpet then he promised to replace the carpet. The issue went back n forth until I reported to the service manager. He reassuared me that they will order me another carpet. The service asdvisor went on to say ‘this is little money, we’ll give you the whole set’. I reported this to Merc SA they contacted the delearship. The delealership said the carpet was missing. But when I go pass to enquire, they keep saying the will order the carpet or they tell me that the lady who must order the carpet is not at work and they will call later to give feedback. It’s now 9 months later and nothing has happened. I eventually managed to speak to the lady at the workshop. She said the carpets are available but no one wants to pay for them because there a discrepancy on the check list - one division says the capert was missing and the other department said the carpet was in the car. The service manager doesn’t even return my call and the service manager says it’s out of his hands. Pls assist in resolving this issue. I took in the car on a different occasion then 3 days later I was stoped at a roadblock only to find that my license disc was missing. The only time I was not with my car was when it was in forcservice but I kept quiet because I felt I saw that 3 days later. In those 3 day I used the car between home n work. Regards NF Munisi car reg: 708 NFM GP.