House Loan Modification

do these loan modification people work, if you already have a fixed rate but the house worth 1/2wat u owe?
will they really get rid of some of the princapal if your house isn’t worth 1/2 as much?
No, you do not “really get rid of some of the principal.” Most loan modification companies are scams.
House values are cyclical, they will go back up. Because the last rise was overinflated, you may not ever see your house value go back to what you paid for it.