Re: Why some of the DLC is not showing on Origin?

Sorry to hear about this problem.  Unfortunately there's nothing anyone here can do.

The AHQ is for "player-to-player" technical self-help and game-play discussions.

We're all just fellow gamers, doin' the best we can...

You need "official" support from the EA Game Advisors.

As the NOTICE at the top-right of every forum says:

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Announcements

For any account maintenance, persona assistance or code related queries, please Contact Us using the Help Center.

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Sounds like you have an account/code problem. 

After getting to the Help Center and filling out the required information, (Product/Problem/Platform) look for the "Chat Now", "Call Now", or "Email Now" buttons, not the AHQ "Ask Now" one.  (You've already done that!)

Be sure you have enough time (at least one hour) to wait before being connected to someone.  😕mileyfrustrated:

Good Luck!