RCI doesn't deliver pizza (I don't think it is on the room service menu either). They charge $3.95 per order for room service between midnight and 5am.
Also, soft drinks used to be complimentary during meal times in the dining room for years. In fact I recall they also had self-serve soda fountains in the buffet restaurants on Princess and RCI, which they'd shut down in between meal times (back when the buffets were not open virtually around the clock). Of course that is all history now.