Had a quote for a system install at $525.00 guy just called me back to say it's finished and is telling me I owe him $843.00 I'm going in to argue it, they charged me for something I didn't agree too. Is this common with small shops? They needed speaker adapter plates, speaker wire and some RCA cables, only extra parts, they estimated that to be a 55$ charge on my first quote. Anyone have experiance with a shop trying to do this? Any advice other than I should have done it myself?