My sun-glass were ******

On Monday the 18th December 2018, I took my vehicle for service in Audi Centre Johannesburg. On my arrival, I took off my sun-glass and put them next to gear lever and I was welcomed by Farzanha who immediately started doing inspections on my car and then ask me to sign for that document. after that, I left Audi premises. I was called by Audi- Braamfontein around 12:00 and informed me my vehicle was ready for collection. I went to collect it, on my arrival I was welcomed by Farzanha who explained what was done on my car and then asked me for a signature again. When I got in my car I started to check if everything was in order with Farzanha. I then realised my sun-glass were missing. We looked for them inside the car and could not find them, she promised to come back to me after an hour as her boss was still in the meeting. she did not come back to as she promised, so I called her and she told me she will call me tomorrow at 9:00. Still, she did not call me at 9:00, I then called her at 11:00, and she said, "they look at the camera and did not see anyone taking them, is your fault, you signed the form there is nothing we can do". Like really the big company like Audi saying these things to a customer. Or, is because they have enough customers so they don't need us anymore?