DP. I called Marriott to convert my old 1-5 cert to a new 1-4 cert, but the hotel I want to book is a cat 5 so wanted to upgrade it to 1-5 for the 70k extra points. They put me on hold and said it was done. But when I went back into my Marriott account I saw they converted it to a cat 6 instead and changed me 165k. So I called back and said I needed a 5. After another long hold she came back and said she had to be sure of the rules because it's complicated but was told she is only supposed to do it if it's being applied to an existing reservation. I said "I am ready to make the reservation, can we do it now?" She said yes and that is what we did. My points totals are still screwed up but she says it will take a day for the credits to come back in. So fingers crossed. Barcelona here we come!