Well, a follow-up comment would be the following:
Read it again closely:
...do they say you did not file it?
.......OR...did you owe them $$ and they are really saying you did not "pay" them the balance due $$ that were on the tax file that you sent (and apparently was accepted) ???
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
