How do you know you have three years and not two? Read your paperwork carefully---and find where it says where the additional time comes from. Ask your attorney why it says three and not two. What does he say about it? What was the crime, was time added for an secondary crime committed such as contempt of court or a penalty for behavior after already in jail? Provide more details.

Was there just a misunderstanding between what your attorney said and what the papers say? In other words do your papers say three, but you understood it to be two? If so, it will be three since it is your responsibility to read, know and understanding what you are saying.