You are still receiving your original refund amount.  The net of the original refund and the amount you owe now is what your original refund/amount owed would have been if the 1099-C was included in your original e-file.

Not knowing anything about your filing status, income level, etc.; I can only speculate about the tax amount.  The amount you now owe is approximately 25% of the income you added.  But there could be other factors that are affecting your return.  For instance, if you had the Child Care Credit and/or Earned Income Credit, those credit amounts could have decreased due to the increase in your income.