Ecomerce business - legal advise

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Three months ago I have signed up with an ecomerce business that does selling items on Ebay. I found the job online and dialed the number on the web. I spoke with the contractor and didn't give me enough details of the program beside saying it's gaurenteed to make money. I got overexicited and signed the agreement. After a couple of days later, I started my session but found out that this is not what I expected. For months, I've been trying to reach the company then I finally got a hold of them recently. I explained to them the situation and now they are telling me I've signed the agreement and there's nothing we can do. I got really pissed off by this. Basically, instead of making money I actually lost $$$. What can I do to get my refund back or to get out of this agreement and paying monthly payment. To me this is a ripoff/scumb and deserve to get my money back. Please advise...anyone???