Terrible Customer Experience

i took my Audi to Audi Centre Sandton for an oil change (25000km) on 7 October 2020. when i got there my fuel range was 310 km, i had a very special cream AUDI RS cap on the back board (bought for me by my wife when i bought the car RS) and my car had no damage. i picked my car up at around 4pm whilst busy on a work meeting on my phone and drove straight to my home (4km away). the next morning as i was leaving to work i noticed that my car had a stone ship on the front grill, my cap was ****** and my fuel range was at 250km. i drove straight back to Audi Centre Sandton that morning before work and informed and showed the service adviser (Mandla) who said he would refer to the dealer principle/manager. i never received any call from the manager in this regards. i received a text from the service adviser a day later saying that the stone chip is an "unavoidable incident" and they will not accept responsibility. there was no record of any stone chip on the pre inspection of my car when i left it there. the cap they will replace with on of my own choice (not the point, i do not need a new cap...its theft!). i texted the service adviser back to say pls get the manager/dealer principle to call me as i am not happy with his reply. NO call ever received. i then escalated to Audi SA who came back to me to say they cannot help with the damage to my car as it is a dealer owned franchise and they have no influence on the way the the dealership can or cannot accept liability. Audi Centre Sandton say that they cannot determine if I damaged my own car or if it happened whilst with them. absolutely ridiculous logic....i will not have gone back or complaints to Audi if it was responsible. I vehemently advised Audi SA that I TAKE PERSONAL OFFENCE TO THIS AS AUDI CENTRE SANDTON IS NOW CALLING MY CHARACTER, HONESTY AND INTEGRITY INTO QUESTION OVER A STONE CHIP! *********!! and definitely not client centric....Audi SA further said that an Audi cap was offered to me by Audi Sandton and that i refused it (not the case) and that there is nothing more they can do for my complaint and experience with Audi Centre Sandton. Very disappointedly i texted the service adviser and send him a picture of an Audi cap (not of the cap i had in my car as the Audi website does not have the RS cap i was gifted) of a replacement cap i would like and asked him to send it to my home as i truly do not have any desire to go back to that dealership or interact with the leadership and management there as they truly do not have the ability to treat customers fairly. the service adviser acknowledged my request and nothing to date, once again. Terrible experience with this dealership...ill never go back there!