I've had people who send a pull request that has 1 commit, changes 2000 lines and fails all the tests and expect me to merge it and spend the time myself to fix

I've had people who send a pull request that has 1 commit, changes 2000 lines and fails all the tests and expect me to merge it and spend the time myself to fix that mess. I've tried to explain kindly why I reject and what to change… but results were poor. The code of conduct doesn't forbid to try, it just doesn't punish giving up.