Should I stop feeding the cat?

My neighbors cat isn’t being properly taken care of. My neighbor replaced her with a dog and 3 other cats. I took their cat back to there house and the cat was scared to stay inside and keeps escaping. She goes right back to my place. I feed her and let her in. The neighbor told me to stop letting her in. I told him to make an effort with their cat. He said he feeds her. If they are why is the cat starving 3 days after talking to them? I’m about to take the cat to the animal shelter. Am I doing the right thing? Should I just let the cat suffer?
Should I stop feeding the cat?
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