Boot trunk cover missing from new vehicle

Hi, I purchased a Chevrolet Spark 1.2 LS 2016 model from William Hunt Edenvale branch and went to collect the car on the 15th of September 2016. After collection I found that the boot trunk cover was not there so I then called the sales guy by the name of Cecil Mpumelelo Mtana who has been assisting me throughout and told him my query. It was agreed that he'd have it delivered together with my license disc.

To cut a long story short, I am extremely irritated, your service is shockingly bad. How dare he raise his voice at me and accuse me of leaving my car unlocked for someone to ***** it. Why would I waste my time and resources calling you guys knowing very well it had been ******?

I want an explanation for this because I will not let this go.

Regards, Rorisang