Last month I added one, to unlock and existing character on an account. It was very quick, less than a minute. Today I added one to create a new character on an account. I bought the 1000 DBC, after clicking on 'add a character' in Services in the Marketplace. After checking I had spent the 1000 DBC, I went out to Character select. Still shows the 3 characters for that account. No slot available for the new character. I exited character select back to desktop. Logged back in to character select on that account. No additional slot. About 5 minutes later, I'm typing this post. I log back into character select on that account, No extra character slot. I had 451 DBC, bought 1,000 DBC. Marketplace showed the increase to 1451 DBC. I clicked on Buy in Marketplace to buy the extra character slot. My DBC went down to 451. Still no extra character slot. I just double checked, and I had to have selected Additional Character slot as there isn't anything else under Services that is exactly 1000 DBC. Any suggestions ? I guess I'll have to Petition.
Well, as the help person pointed out kindly, it was right there in the backpack of the character who had bought it. Never mind.
I figured out how I became confused. Previously I had bought the Additional Character Slot from character select. This time I bought it while logged into the game. This second way placed the token in the character's bags. The first just adds it to Character Select.