Well, two things.
1.) You could ask to amend the agreement and offer $2000 upfront instead in one lump sum. (Make sure you got a source to do that...whether its family, friends, income, asset sale, even if its a pirate payday loan store, etc.) Many lawyers will take money up front for a discount. This gets issue done and over with. That is key. They can't come back and say...you missed 8th payment...shredding the whole agreement, even though you made 23 payments on time.
If you trip, it all goes back to the original amount owed and you really lost the payments made!!!!
Always do lump sum, if possible, in cases like this. They can't deceive you, or trip you, on the plan to extract more out of you later. Lump sums put matter to bed forever.
2.) If you default, or breach, on current settlement agreement, case will go back to original status. If its a signed written agrement, you could be sued for breach of that agreement and that is much harder to defend than a garden variety JDB case because the settlement agreement is a CONTRACT between you and JDB.
When its just a credit card, they have no direct contract between you which in many areas of U.S. is much harder to prove the relationship and standing to sue you.
I wouldn't breach, but just ask lawyer if a "slight discounted lump sum" is better and suggest a lump sum number to erase this now. ($2000 my suggestion, here)