Not all Chips away are the same as it's a franchise. I used them and they oversprayed my bonnet when painting the bumper. But this was in the east yorkshire area. Cant you do the chip yourself. MER do a chip kit and I've used it with great results ,it just takes a bit of time.
Buy a touch up pen from Audi and dab some on in several layers then wait till you have a few chips and then do Chocks-Away (other smart repair companies are available). If I did a smart repair everytime I had a big stone chip I'd be there every week having work done. You could invest in paint protection film ( Venture shield) and this will help in the fight against the dreaded chip it's not cheap however.