No need to call. We booked yesterday. The cruise wanted a $500 deposit (and there didn't seem to be a way to put more on it at that point). After that was paid, DH went into our cruise and added payments from all the other cards that we had offers on. It was pretty easy, really. We ended up not using a TA so that we didn't have to go through one for all these payments. My friend's TA kept telling her she wouldn't get the deal on the second card, and didn't want to bother with making a payment from it, but she persisted and it credited. I didn't want to have to deal with that so we booked directly with Celebrity online.