Thought I'd add to this as I thought there'd be more clickable options when the report went thru and I know you've been having a lot of false and fake reports. Simply put: randomly votemuted for no apparent reason, I'm not sure if that really qualifies as abuse or anything, but I'd think just calling a random vote to mute someone would.
 
Once without a reason is generally accepted, if he does it over and over it's a problem.
 
My apology then, wasn't sure if for absolutely no reason counted or not, you can mark this invalid then.