How do you disable mis-behaving scripts

I recently found a script running on a reseller account which is leaving orphaned processes, which after a while starts to affect server load.

What would be the best way to disable the script? I don't want to delete it or disable the entire account. I just want to wake up the account owner so he/she will take a look at fixing it. I've already informed them several times via helpdesk about the problem.

 

 

 

 

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