I got a letter from them 2 years ago telling me due to interest on the money I owed them and paid promptly I still owed them $3.25. The very next day I sent them a check for $3.25.
A week later I got another letter telling me that from the time they sent the last letter until they got my check, another $2.26 in interest had accumulated.
I kid you not!
So I sent them another check, this time for $10, with a not telling them I was sick of that crap and to apply whatever was left of the $10 to the next year's taxes.
I did not hear from them again.