If they made a correction they would notify you. The phone call will answer that if it got lost in the mail. I had the state make an error once and they sent me a check for 6K. I called them and said it was an error but they said to keep the money. They found their error 4 months later (probably from someone saying where is my 6K) and they asked for it back (which I expected would happen). No free lunch that time.
