So I bought modern warfare two

You're welcome!
Hope the game appears soon in your library and order history

Take care in the meantime!

Oh, thanks for letting me know that

In some cases a purchase can take up to 48 hours to be reflected in your account and in-game

For now the best option is wait this time buddy

But just to let you know that if more than 48 hours passed and you not receive the content yet or the game finally doesn't appear in your order history, probably something went wrong with the purchase and Microsoft is going to refund the money to you

That's because it's not out yet

You know we ain't in October right?

It isn’t in my billing history at all but I know I bought it because the money got taken off my card and the game came on my console but it doesn’t seem like I own it

Hi and thanks for reaching Microsoft Xbox gamer's community. My name is Josef.
I'm an Independent Advisor and a Microsoft Xbox user like you.

Hope you're doing great today Quincey

Are you able to see the transaction in your Microsoft account order history?
https://account.microsoft.com/billing/orders

Or not yet?
And, are you able to see in your owned games library or not yet? (In the console)

I'll be waiting for your reply, greetings