A thankless task.
Not sure there's a single noun that covers it. The obvious adjective would be unappreciated.

'Trying to help someone, but the other party doesn't appreciate it'
I began reading the KJV a couple months ago, and one question that keeps plaguing my mind is, "How did Adam and Eve successfully hide from God?"

Genesis Chapter 3:


  8 And they heard the voice of the LORD God walking in the garden in
  the cool of the day: and Adam and his wife hid themselves from the
  presence of the LORD God amongst the trees of the garden.
  
  9 And the LORD God called unto Adam, and said unto him, Where [art]
  thou?
  
  10 And he said, I heard thy voice in the garden, and I was afraid,
  because I [was] naked; and I hid myself.

