As mentioned in the thread, players who are missing their monthly Cartel Coins need to directly contact our support team (keep in mind that sometimes those can be just delayed for a few days).
You can directly contact them with an in-game ticket or at this email address: support@swtor.com. You need to make sure that you're giving your account name or send the email from the one linked to your SWTOR account. More information here: How to contact Star Wars: The Old Republic (SW:TOR) support.