There is no reason not to pursue someone for a $22k debt when you have a signed promissory note. I suggest you contact an attorney in your jurisdiction to help you collect this debt.
The statute of limitations on a written contract is 4 years. The statute begins to run as of the date of the breach which is the date of the last payment.
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If you sue them, it will stop the Statute of Limitations from running. Also, they might get serious about paying you if they are sued.