Assuming this is the Ghost product installed, pretty clear cut in terms of their position on this:
https://www.sasmobile.co.uk/tech-details/Autowatch-Ghost-FAQs
First step is for Audi to make categorically clear that they are voiding the warranty because of the Ghost. Second step is to use that as a stick to get the Ghost manufacturer to prove otherwise (given their stated claims).
Edit*
Isn't that just an independent dealer/installer of Ghost? If the OP got it installed by them then i think he has a good chance with this, but if not it is probably irrelevant .
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