I have only did this twice as it is extremly hard to do.

What you have to do basically is join a wager match game I suggest high-roller.

Once the game starts and you see the map loading you have to unplug your Ethernet cable from your xbox and turn your xbox off at the same time, right when you see the map load (When you see your character basicaly)

Very hard to do and you must be very quick!

If you did this right for example you had 10,000 cod points you do the glitch you go back to black ops it will say you have been refunded 10,000 then you should have 20,000.

I only did this 2x and im not sure if you need host so.. someone else can give it a shot

If this helped you get what you want +rep and thank topic greatly appreciated