Now that they're represented and have filed suit, you'll have to contact plaintiff's attorney to arrange payment.
Usually how it works is you offer to pay them in exchange for withdrawing the suit. You want to find out what their process is for that, and how you can verify that it has been done. So basically you'll want everything in writing, and once you get that, you'll want to confirm directly with the court that you are squared away.
Depending on the court rules, they may be able to withdraw the case in advance of the court date, or somehow notify the court that the case has been settled. It varies. You just want to make sure that you understand the process. You can also call the clerk's office for the court to try to figure this process out.
You will also want to get a document called a "release" signed by them, which releases you from any further obligation to the original creditor or the plaintiff CA with respect to this debt. They should have a form release that they routinely use.
