I don't understand why a deposit was given on a quote. As you said you had full intentions of buying the unit and were picking it up saturday. It sounds like you purchased it. When we got quotes on anything, TT included we never gave a deposit, never signed anything. We may have had the dealer sign stating how long the quoted price was valid for. Quotes are not usually written out as a contract as your situation seems to have.
Good luck with this. You need legal advice. Keep us informed please. There may be a lesson here for others to take note of.
