there's a big fb group for Casino Royale for more help. I had a $100 credit from the casino, my TA booked it but had to go through the Casino Royale travel people. Also its likely you have 3 copies of the same certificate b/c of the same number.
you should be able to go to clubroyaleoffers.com to check, your C&A number is your casino #. The casino travel line can book this for you. When i had my travel agent book it (MEI), they still had to go through the casino to use the offer/credit.