Thanks for everyone for above information. First time using this benefits, I called twice to ask for various quotes and called once more time to booking. (Took forever T.T)
Informaiton gathered:
- The email I got say the number to call is +61 2 8225 0042, but if you call that need a transfer every time, actual direct line should be 1800 782 948.
- Conceirge say refer to expedia.com.au for availability and price reference, but after comparing several hotels' quote I'm quite convinced the price quoted is in line with au.hotels.com when I logged in as a member.
- The rebate will get is in line with when you click "Price Details" on the room type you want (The one night base price will be the rebate amount, that's excluding tax, it it will be slightly less than the actual 4 nights average from the total amount)
So overall, next time if I were to do it, will find out the pricing from hotels.com, decide on exactly one or two hotels and room type, then call the direct line to confirm and book directly. Then hopefully the booking process can be done in 5-15 min.