Deductions & credits

I just sent lots of pages to the Fraud Dept. at the IRS.  It shows where my refund should have been $4658.  Then, I got a notice from the IRS it was going to be $1899.  Then, I received another notice that it was going to be $1858.  Then, I finally got a direct deposit of $1798.  HUH????  How did this work???!!!!  E-filing is FREE - so where would ANY fees come from?