I am not a bird person. I inherited a bird. A cockatiel. No idea how old she was, but she was a mean one. So mean no one would take the time to deal with her, so I got her. I named her Tisha, after Mortisha, she was evil. Bit me at every chance. I was determined to win her over. I did as someone has suggested. I started leaving her door open, since I wasn't allowed in. It took a LONG time, and a lot of patients. But eventually she "liked" us, she would come out and walk on the floor with the dog, chase the cat. She didn't like being handled, but would let me pick her up. She is the only bird I ever had.
I woudln't give up on them, They need time. Tisha would bob her head when she was excited or happy. Don't know if that is of any help.