She's got a really thick accent, or she's mumbling- he can't make out a word she's saying.

"Hey! Speak up! I can't hear what you're saying, and I need to know what it is you're saying if you don't want me to... report this!"

Report to who, and for what, exactly? He's not sure, but this is clearly some sort of transgression against some rule or other. There's someone who he can report this kind of misbehavior to, he's sure.