K.P.
If you paid using a check, see if the bank can provide you with a copy of the returned check so you at least have some proof that you paid for it. Same thing with the credit card (if applicable). If you paid cash- oops!
I would say this, attorneys are not cheap so make sure you know how much it's going to "cost" to get your reimbursement before you sign-on. If it's going to cost you more than the reimbursement, then you may want to chalk this one up to "lessons learned" and report the person to the BBB.