How can I help my son get out of jail after he was falsely convicted of sexual molestation of a minor?

I need help. My son's ex-girlfriend's daughter said he molested her from the time she was 8 to 14 over 250 times. This is a lie. He was convicted but his lawyer did not allow anyone to testify for him. No medical records to prove he could not have sex. He hasn't had a girlfriend in 10 years. Medical reason will show he could not have done what she said he did. No one will listen to him. She set up him and the state judge along with his attorney. They all plotted to send him to prison from the beginning. The lawyer did not talk to his family or friends that lived in his home during the same time. His daughter, the key witness, was blocked from coming to testify at the last minute. He was never alone with the young girl. She set him up and had all her friends lie. Her friends stayed overnight at his home with her but, nothing ever happened. They testified to this. He was and is a loving, devoted father. He was given 120 years, while another person was given only 30 years and another in another county was given 25 and they were caught. He did nothing and got 120. She was also proved by medical specialist to still be a Virgin. I need to know how to get him out of this and how I can find someone to help us without charging us everything. I do not have a lot of money and the lawyer that did nothing took everything he had saved up for he and his daughters. Can someone help me?