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I'm sorry to hear about your situation. Unfortunately the right to rescind in Maryland is limited to a very few types of contracts: http://statutes.laws.com/maryland/real-property/title-7/subtitle-3/7-310 . There is in general no general 3 day rescission rule on contracts in Maryland. There is such a rule lending agreements, certain vacation home contracts, contracts sold by door-to-door sales reps and a few other categories with highly specific laws addressing those issues, but not / matchmaking services. In general, there is NO such law unless a specific provision of law specific type of contract creates that exception.
Many consumers mistakenly believe all contracts allow a 3-day cooling-off period to cancel. Generally, there's no cooling-off period after you sign a contract. (In Maryland, only a few types of transactions, such as door-to-door sales contracts, allow you a certain number of days to cancel.) However, if the dealer promised finance terms, such as a certain interest rate or monthly payment, and is unable to honor those terms, you can't be forced to accept other terms and may cancel the contract.
Now if you feel that there was fraud and deception, you can certainly file a complaint with the MD attorney general's office: http://www.oag.state.md.us/Consumer/complaint.htm
And if the contract itself gives you the right to return it or a warranty, then you would have such a right. But otherwise it's going to be "as-is", and your only recourse would be what the seller gives you back. Now if you threaten to go to the BBB, Chamber of Commerce, etc... then maybe they'll work with you, but they have no legal obligation to do so.
I know this is probably not what you wanted to hear, but it is the law. I hope that clears things up anyway. If you have any other questions, please let me know. If not, and you have not yet, please rate my answer AND press the "submit" button, if applicable.
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Thank you, ***** ***** luck to you!