The official response came: 

Thanks everyone for letting us know that you have not yet received your Complimentary Cartel Coins.

We are aware that some players did not receive their subscriber reward Cartel Coins as expected this month, we’ve escalated this to our development team who are currently investigating the issue and who will make corrections to all affected accounts.

We’ve been advised that all players awaiting their grant should receive the coins due to them in the next 7 to 10 days.

Please accept our apologies for the delay in receiving your coins.

Thank you for your patience and understanding.

It kicked off royally on their forums thereafter.

http://www.swtor.com/community/showthread.php?t=589004&page=28

Not in anyway excusing it, but I would suspect the problem is with Origin.

The Cartel Shop, buying Cartel Coins, subscribing, ugutal deluxe upgrades, all seem that you are buying them from Bioware, but it's actually just a portal to EA's origin servers, which have had these problems for all of their games.

To say the least, it gets people really Steamed. (Hardy har har.)

Alternate title: Lie with dogs, expect to get fleas.