I don't want to talk to the girl who is always texting me and harassing me. How can I refuse?

Did you make it clear to her? If you don't like her, tell her clearly. Don't say anything. No rejection will make her misunderstand that you have accepted her.

Tell her, you take her out and make it clear to her face. Of course, you can text her or call her. You tell her that she is good to you, but you can't force emotional things. If you don't want to fall in love, you can't give her happiness and it's unfair to her.

Don't be afraid to hurt her. She likes you, and you can't hurt her no matter how you refuse. The only way not to hurt her is to be with her, but since you don't like her, it will only hurt each other. Let's give her a good time.