(adsbygoogle = window.adsbygoogle || []).push({}); This could be a possible method to unban you from black ops. as treyarch ban your MAC adress. you could try and spoof your mac adress by using this method:
download a program called nmap and follow these instructions
Listen” in on network traffic. Pick out the MAC address. This can be done with a plethora of freely available security tools, including Nmap.
Change your MAC address.
You can spoof a MAC address when using Nmap with nothing more than a –spoof-mac command line option for Nmap itself to hide the true source of Nmap probes. If you give it a MAC address argument of “0″, it will even generate a random MAC address for you.

For more general MAC address spoofing, your MAC address is trivially reset with tools available in default installs of most operating systems. Here are some examples:

Linux: ifconfig eth0 hw ether 03:a0:04:d3:00:11
FreeBS ifconfig bge0 link 03:a0:04:d3:00:11
MS Windows: On Microsoft Windows systems, the MAC address is stored in a registry key. The location of that key varies from one MS Windows version to the next, but find that and you can just edit it yourself. There are, of course, numerous free utilities you can download to make this change for you as well (such as Macshift for MS Windows XP).
hope this helps, havent tested it myself, ITS JUST a THEORY!!!!!!

some downloads that may help :
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