Battlefield Bad Company 2™ Vietnam Key has not been given to me

Basically i purcahsed the Battlefield Bad Company 2™ Digital deluxe edition, and i have not been given the key for the vietnam expansion.

I am not mentally deficient, i have checked all my spam folders, all my origin related emails, and i have tried to play the expansion pack, but it promps me for a key, which i have NOT been given. This is all that the email gave me: http://gyazo.com/d1eaa8cca8e238703bdd660c16c54847 Note: I used my browser to change the text of my games CD Key to 'xxxxxxxxxxxxxxx' Just because... well im not sure, just not sure if it can be re used.

Many thanks all who attempt to help.