Tax Year Prior to 2020: Filing Dependents

My parents claimed me as a dependent when I did not qualify to be their dependent because they do not provide more than half of my support even if I am a full time student that lives at home. Their CPA did not carefully ask any questions about my 1098-T or income and went ahead and assumed that my parents provide more than 50% of my needs/expenses. 

 

How can they amend this mistake so that I can file my taxes on my own.