Dishonesty and unkept promise

I took my car for a service at Audi bruma

I paid for the diagnostic without hesitation I did not proceed with servicing the car when I collected my car there was a wheel center cap missing

Representative by the name of Alex that sits next to Dylan promised to order one I had to keep following up with him which was really frustrating Alex eventually said he has one I should send my driver to collect the wheel cap my driver gets to Alex Alex states that the piece was sold this has been a back and forth situation between Alex and I he can’t keep his promise and I would like my wheel cap