Here's how I did it...
You are now ready to chat with Mahendra.
you: lo
Mahendra: Hello
Mahendra: Please explain your issue?
you: Tell me about the physical warefare pack?
you: *warfare
Mahendra:
Mahendra: Grants additional weapons. (Image link)
Mahendra: Type 88 LMG with bipod (light machine gun)
Mahendra: Flechette Ammo for DAO-12 Shotgun
Mahendra: Flash suppressor for SKS sniper rifle
Mahendra: Day 1 Access to DAO-12 shotgun
you: yep
you: Where is my key?
Mahendra: May I know from where you purchased the game?
you: Origin
Mahendra: Could you please provide me the Order number and Email address from which you purchased the game?
you: XXXXXXXXXXX
you: do you really need the email address also?
Mahendra: Yes,
you: *@*
Mahendra: Alright, I checked and fount that you pre order the game and didn't get the Physical warfare pack. Please allow me a minute. I am providing you a new code.
you: Thank you.
Mahendra: This is the code for your Physical Warfare Pack : XXXXXX
you: One moment while I try it, please?
Mahendra: Please redeem the code in your Origin account. If any problem persist, let me know.
you: Please wait...
you: That seems to have worked, thanks.
Mahendra: Is there anything else I can help you with today?
Mahendra: Thanks for contacting EA customer service. Bye and take care.
The chat session has ended. Please contact us again if you need further help.