I don't want to talk to him

So my biological father really hasn't been in my life he doesn't know me / what I like he's never bought me anything and the most important times he should've been in my life he was never there. He used to see weekly when I was about 10 years old then that turned to monthly and than once in a blue I would see him. I don't have a good connection/ relationship with my brothers because of him and now he calls me for favors to fill out a job application or to make /delete a facebook that's the only thing he talks about when he calls me. I used to do these favors for him because I cared about him but now I'm just not picking up his calls I really don't want anything to do with him. Am I wrong for that ? I kinda feel bad but I feel like he just uses me and I don't need someone like that in my life