1. Private sale. Audi have absolutely zero liability to you for any faults. It appears that you knew that the car had faults prior to buying it (your 'friend' had taken it in after an emissions light came on) and yet you still went and bought it. So 'caveat emptor' applies - which in law means 'buyer beware', or, to put it more bluntly (but politely), 'tough cookies'. Replace 'cookies' with the word of your choice. You wanted a bargain, so bought a used car privately. That comes with virtually zero buyer protection, which is why it's cheaper.
2. The wrap, and damage. Of course a wrapping company is going to tell you that the entire car needs re-wrapping, they're going to want to make as much money as possible.
However, ask yourself this : would it be reasonable to expect the entire car to be re-painted if a single panel had been damaged ? Of course it would not be reasonable. As long as they can get a reasonable match, then you have absolutely no grounds for complaint. Wanting to take it to a wrapping specialist would not be 'reasonable'. It's a used car, not a new one.
I think you've approached this badly, and may have irrecovably destroyed any trust between yourself and the dealer. I think you'd be a fool to take the matter to court, unless, of course, you want a really big bill at the end of it all. The court will judge what is 'reasonable', in the grounds of liability. You not knowing who wrapped the car, or what make of wrap was used, is no liability of anyone but yourself.
Now, I asppreciate you might not WANT to hear this lot. You seem to feel you are in the right, and will probably reject any advice that says otherwise. However, you really need to take a step back, take a deep breath, and get a bit realistic.
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