Okay when someone says they "Reported You" it's probably true, but the real fact that MW2 is not on VAC Secured servers which means the "Mods" they're reporting you to cannot ban you at all.
Reporting to Mods on the VAC Forums is the ONLY way you can report someone.
And yet the THOUSANDS of reports a day they probably get from all the names combined might take them a freaking while to actually get to You're Report...
It says right on the info about VAC that reporting hackers on a none VAC Secured server game means the Mods cannot do anything about it.