Where can my blind friend find help for SSI paperwork?

Recently, my totally blind friend was given notice that several thousand dollars of his SSI payments had been sent to him in error because his resources (some sort of insurance stock) had bumped up ever so slightly above the $2000 limit. He will have his payments reduced by ten percent until this money is paid back.

He called the number on his notification letter and was told that he could appeal if he wanted. My question is, where can he find someone in the Western New York area that can guide him through a process like this?