I am new to Mturk for about 2 weeks now. I've completed over 500 hits and just got my first rejection and it was marked "Wrong Code" At the end of the survey I didn't receive the code but, the two other surveys I completed for the requester I did get the correct code (the are marked pending as of now). I contacted the requester and she said: It’s InnovationVentures or just put your name I won’t reject it. Thank you so much. I can't retake the hit....So how do I either get it reversed to accepted OR have the rejected removed? I messaged her back explaining I did complete it and she marked it as rejected.
You can ask the requester to reverse the rejection but there really isn't anything else you should do. https://docs.aws.amazon.com/AWSMechTurk/latest/RequesterUI/ReversingRejectedAssignment.html