How do I submit a ticket to 2k, sorry for ignorance!

So I input the locker code twice within 1 minute of the code releasing on tweetdeck. The first time I input it , I received this message “Locker code accepted”… so thinking that seemed odd I input the code again right away and I got the same message … no pack in my queue I just checked … I at least want to try to put a ticket in for this to see if they’ll help me out.

Sorry for the ignorance but how do I go about submitting a ticket ? Thanks