Are drink sellers short-changing customers?

The May 4 report ("Starbucks sued over amount of ice in cold drinks") had a customer saying that an iced drink at Starbucks in the United States, touted as containing about 710ml, actually has only about 415ml of fluid.

In Singapore, it is also a common practice for drink sellers to fill a cup to the brim with ice before pouring in the fluid.

If one is to measure the amount of fluid in the container, it would not be surprising to find that it takes up not more than half of the size of the cup.

If customers request less or no ice, they are slapped with a surcharge, since more fluid would be needed to fill up the glass.

What is the Consumers Association of Singapore's take on such a practice which seems to be short-changing customers?

Tan Jeh Yaw