Read the contract, the entire contract.
Getting your money back depends on the contract.
Signing it (or not) has no bearing on getting your money back.
In fact, if you were smart enough not to sign it, why were you tricked into giving them your money?
No need to answer, just think about it.
Ask for your money.
You'll get it, or you'll not get it.
That determines your next steps.
If you get it, no worries.
If you don't, you might have to sue them in small claims.
That ain't easy, and often results in nothing more than frustration.
The lesson here is, don't pay until you take delivery.
If someone wants money before you get the product, don't do the deal.
The only place that works is when the government gets paid before you do. That's called taxes. See how that deal screws you????