We purchased the ticket +transfer service where we put our hotel name in the note which we thought that there will be pick up sevice from the hotel. On the day we had to call them and found out that we had to book for the pick up service ( there were no instructions on traveloka or on the email we received). But we managed to get to Marina Square on time for the shuttle to USS.
Ps. My friend did ask traveloka thailand and they inform us that the shuttle will pick up from the hotel at 8:30.