Should I ignore them or just keep helping them?

Anonymous
At school, there are this 2 girls.
(No need to read all that, I just wanna know how to tell 2 girls I don't wanna tell them what assignments we have for hw)

One of them texts me and asks me for homework everyday for 3 years now (it could be more) and she's really annoying. Like if I don't reply to her she's gonna ignore me the next day at school. But then, she's gonna ask for hw again.
But what's worse is that sometimes, she asks me the hw at school and then asks me at home and I explain to her, but she doesn't understand so I have to send the hw already done.

Also for all this years I printed her A LOT of papers at home, from my papers and ink, and Ik I told her she shouldn't pay me, but she literally texts me in the evening, nearly night and wants me to print her some things.

And yesterday, she asked me to print her something, and the photo was the worst. The background was light green and the text was white, but I can print just black white, so I didn't change anything in the photo cause it was freaking 12 am and I was nearly asleep when I remembered I had to print her that.

But today, her seatmate was like "hey, what's this?" and started laughing at how the photo was cause you couldn't really see anything and that girl was also looking at me kinda weird. Man, I was on the verge of insulting her, but I didn't.

But like, I'm not mad she uses me, I just feel dumb cause she's really shy, but then she can be the worst when texting (and I can't even understand what she texts, it's like a bunch of numbers and letters). I just don't wanna be friends with her anymore

The other girl is annoying cause she looks at her phone during classes and then asks me what assignments we have.

How should I tell them kindly to stop asking me for hw? I tried ignoring them for some hours, but the keep texting me
Should I ignore them or just keep helping them?
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