Mahindra Service Broke my gear cover

I received terrible service at Mahindra East Rand, I always take my car there for service ever since I bought it. But the service I received recently has been horrible, when I went to fetch my bakkie after a service I discovered that the gear cover is loose (broken) and I told their customer service agent. The manager, Hennie told me to book it in which I did, and now he is giving me all sorts of excuses. He says they didn’t break it. The question is who broke it then? I am extremely angry about this.