Well, two weeks are bad, but three weeks??
I emailed to Novotel Nusa Dua that I will use my complimentary room upgrade certificate. I usually e-mail the hotel first to make sure that everything is OK before I make booking. Days by days passing by, but I didn't receive any email from them. As a comparison, I've e-mailed other hotel in Asia Pacific without any problems, Novotel Citygate HK, Grand Mercure SG, Mercure Wanshang Beijing, Ibis HK, sofitel Saigon, Novotel Majestic, including other Accor properties in Indonesia (excluding Novotel Nusa Dua ofcourse). They usually e-mail me back maximum in 1 day after.

I phoned the sales manager of Novotel Nusa Dua, and after additional two days without notice, finally I cancel the reservation in Nusa Dua and went to book their neighbor, Courtyard Marriott Nusa Dua. Finally I just got official email from them that I could use the certificate but cannot use the certificate for the 2 bedroom suite with pool since it's very limited. It can be only confirmed for 24-48 hours before. Lol.. Thank you then, no apologies, and no certainty. Just say goodbye Novotel Nusa Dua. Never again.