Arrugar un papel o pedazo de papel (hacer bola/bollo un pedazo de papel)

To crumple up a piece of paper (into a ball)/to crumple a piece of paper (into a ball).

Sylvie crumpled up the letter and threw it in the bin.
Cambridge Dictionary Online.

Dan tore the page out, crumpled it, and threw it in the wastepaper basket.
Longman Dictionary online.

Why did you crumple up the bill?