The 1099C may have been some prior debt and if IRS asked you about it in 2016, it was for a prior year return.
The 1099C should have been reported on that year, and IRS did this for you. It does not go on the 2016 return.
Note: IRS shares information with the states, so if it was taxed on the Federal return and you are in a State that has income taxes you will be a letter from the state also.
