My question involves collection proceedings in the State of: Louisiana

My husband and I sold our car to some friends (yes, very bad idea I realize this now) in January. We made up a contract with the notary discussing payments and dates. The notary however, neglected to tell us anything about putting a lien on the title, and instead said we should sign the title over because we have the contract. (I only found out otherwise after going back to ask them their opinion of the situation that was not true.)

They have made only 1 payment since January (when the car was sold). They still owe nearly $700 and refuse to send payment. They keep saying they don't have any money to give, not even $30 to put towards it.

Do we have any right, or is there any way that we can get the car repossessed? Otherwise, will it resort to going to court because isn't all they can is order them to pay the remaining balance? There is no way for them to check up on it, we may still end up screwed.

Very confused and frustrated, thank you in advance for responses!