Don't give up, someone probably used the wrong type of oil to oil it. Heat it with a hairdryer and then work it up and down. I have used a piece of rubber (inner tube or drawer liner) to protect the metal, and clamped vise grip pliers onto the presser bar, and then tapped the pliers with a hammer. It will come loose, then clean it up good with kerosene or WD40 and a soft brush or cloth.