Beyond belief sounds like replacement, but taking a fender (front?) off and working it with a short 2x4 and 4 lb. sledge has merited some good results in some cases. Also taking out the inner splash shield for access from behind could save some grief assuming the cage nuts aren't rusted tight to the bolts and spin. You'd have to see if the inner half of the fender has open spaces located where the damage on the outside is.
