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I cosigned for a friend who is not paying the payment
Cosigning is explicitly a promise that you will make the payments if the primary signer can not. Don't do it unless you are able to handle the cost and trust the other party will "make you whole" when they can... which means don't do it for anyone you would not lend your money to, since it comes out to about the same level of risk. Having agreed, you're sorta stuck with your ex-friend's problem. I recommend talking to a lawyer about the safest way get out of this. It isn't clear you can even sue the ex-friend at this point.