Date registered: Aug 2002
Vehicle: '85 2.3-16 '99 C280 '11 GLK350
Location: Scottsdale, Arizona, USA
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If you have "a writing" then you have better evidence of a contract, provided that it specifies the essential terms of the deal. The dealership may claim that he had no authority, however unless you had direct knowledge of that, their "agent" can bind the principal.
Even without a contract, the partial performance of the terms may establish the existence of the verbal contract, however it may not do much in terms of proving the contracts length of time (term) or provide much in the way of value.
BTW, your remedy for breach likely isn't "strict performance" but more likely a monetary remedy, since there isn't any particularly unique service offered by the dealership.