Interest accrues after judgment in NY at a rate of 9% per year. I would ask HR to provide a copy of the 'new garnishment' figures, as you should really check on the calculation.
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Interest is 9 percent per year so if you were only paying the principal you likely owe more money.
I am a former federal and State prosecutor and now handle criminal defense and personal injury/civil rights cases. Feel free to check out my web site and contact me at (212) 577-9797 or via email at Eric@RothsteinLawNY.com. I was named to the Super Lawyers list as one of the top attorneys in New York for 2012. No more than 5 percent of the lawyers in the state are selected by Super Lawyers. The above answer is for informational purposes only and not meant as legal advice.