Tax return.

Lauren • Name is Lauren and Justin has my heart
My dad kicked me out of his house back in november. When I filed my taxes this year I claimed myself and I've already got my return. I haven't talked to my dad since he kicked me out. He sent me a letter to my work a week ago saying he claimed me and that I couldn't claim myself unless I do an amend but I filed and got my return before him. Any ideas?