Yes, you definitely can and should sue the borrower of this loan for having made these payments.
You can file suit yourself or with the help of an attorney. You can sue in small claims court if the amount does not exceed $6000.
Here is a link to help you for small claims court: http://www.okbar.org/public/brochures/sccbroc.htm
If the amount does exceed $6000 you would need to file suit in circuit court.
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Courthouse Address:P.O. Box 1350Muskogee, Oklahoma 74402
Here is the address and telephone for where you will file suit. Here in my state, the clerk of court has a simple form that you can fill out if you are representing yourself. I would suggest calling them about this.
I have been trying to find you a link that would tell you in detail how to do this as the small claims link did; however, I cannot find one.
Here is the link though to a list of attorney's who can help you with this case:
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