Sorry for the delay, but by the time you responded to my post I was asleep for night and no longer at the computer.
The issue here is whether this company did everything for you that they contracted to do. If they gave you all you bargained for and you did not make any money from their efforts, that is not their fault. If, on the other hand, the site that you paid them for wasn't functional, or if the leads that they gave you were all stale leads, or if they made written guarantees or promises that didn't come about, then you would be on safer grounds if you had to ultimately sue them for a return of your deposit.
If they didn't give you all they promised you, here are the various steps that you could take to try to address this and get a refund:
If you have tried unsuccessfully to negotiate with the company to have them remedy this situation, your next step would be to talk to your bank or credit card carrier tell them that you are the victim of a fraud and dispute the $4,500 charge. Typically, they would not be liable for money you withdrew voluntarily, but sometimes, they may be able to do a chargeback for you if you didn't get what you paid for.
If you try this and get nowhere with your bank or credit card carrier, you can contact a lawyer to write a strong letter to the company, listing the various ways they have breached their contract with you and misrepresented their services and telling them that if they are not willing to refund your money then you will have no choice but to take them to court and sue them for breach of the contract and for their fraudulent and deceptive trade practices.
You can do this for yourself without a lawyer, though it has more teeth when the letter is on a lawyer's letterhead. A successful suit involving fraudulent and deceptive trade practices would entitle you not only to your monetary losses but to treble damages. A letter mentioning the unfair trade practices law should make any real company think twice and, hopefully, settle up with you. Since you're not hiring the lawyer to do anything other than write and draft a letter, it should be low cost.
Meanwhile, you can file complaints with the US consumer protection agencies we have. Go to the Better Business Bureau's site and lodge a consumer complaint against the company. They are at www.BBB.org. As a non-profit organization committed to protecting consumers, the BBB will try to intervene on your behalf and to resolve your problem if they can locate the company and the company is willing to work with them.
From there, you can file another complaint with the state attorney general's office in the US state where the company is located and with your state. You want to emphasize that the company has breached its contract with you and engaged in fraudulent, unfair and deceptive marketing practices.
You can also report them to the Federal Trade Commission at FTC.gov
If all else fails, you can hire a consumer rights lawyer or sue the company yourself in thei state's Small Claims Court.
Ultimately, if you are the victim of the scam and cannot recover from anyone, your unreimbursed losses are tax deductible. So you can get something back in the form of a deduction when you file your 2017 income taxes.