Irresponsible response from Audi

Bought A3 1st week of Aug and paid for Smart Phone interface at the showroom.When I took the delivery of the car, we found that USB is not working and they said there is no stock of dual USB to replace and asked me wait until end of Aug.I never received any feedback and then called last week and the feedback is still no stock.Moreover the response was very lethargic and they don't have any idea of when would I get the replacement.The guys blaming Audi SA and VW SA for not giving proper answer/ETA and I have requested them to provide whom should I escalate and no response and I said I will write in a social media and the feedback to me is to go ahead.What kind of service is this. Another issue, they asked me to fix number plate noise for which I went to the Northcliff showroom from where I booked the car and found the floor is completely empty and we haven't received any notification that they are moving and when I call from there, the response is that you(me) already know that we have they have moved?