Injustice hurts. I know from experience in a very similar situation that happened 45 years ago! The two "friends" who teamed with me both got A's and I got a B! And they both apologized after the class--but not enough to let the professor know who should have the A, I had created the project, and did ALL the WORK and they knew it. I learned a great deal. When I was teaching I never gave group projects--I knew the truth. Sorry you have had this lousy experience.