There was no change of heart, as Defendant did not know anything of this case before it was served. Defendant doesn't want to talk with Plaintiff or Plaintiff's attorney. Can't it just be done through the court. The payment made in the amount requested to the court?
You'll have to inquire of the court.
Usually the court won't respond, as that is unethical (ex parte communications).
You can hire an attorney to arrange this for you.
Or, you can appear in court and direct your remarks to the bench.
This depends on what type of court proceeding (small claims is very informal), but one will normally be allowed by the court to "be heard".
If allowed, that is one way to acknowledge your willingness to pay.
If an answer is required in a proceeding, they usually are, simply respond by admitting to every pleading and acknowledge your willingness to pay.
Be warned, its bigger than the defendant's $500 or $5,000, if they have an attorney.
It could mean you paying their attorney's fees, costs, expenses, etc...
Before you rush things, it might be best to seek the advice of YOUR attorney.
You could end up agreeing to pay more than you know for longer than you expect.
It might also open you up to other plaintiffs.
No need to comment further, or explain, good luck.