That is ridiculous! Just because someone has an interest in car audio doesn't mean they have all the time or skill in the world to design and build a good system. People with money may like to pay a Professional to do a Professional job on whatever they hire that person for. A lot of people started DIY for the passion of learning or to save themselves money (usually the latter). There still is people who do professional work for a reasonable price out there. Obviously, this was not one of them.
OP, if anyone ever pushes a product as hard as this shop did to you - walk away. This place could be in serious jeopardy for how they treated you. I won't go into the legal details, but you do have room for recourse. I would contact your local BBB office to see if they have any other complaints. At the very least, contact a lawyer and see what they may be willing to do for you. Its not a good idea to change anything until you seek legal advice. Just trying to help! //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif