Fall on deaf ears
Definition 1 of 1
Pro Tip 1/3Emotional Weight
The phrase often carries frustration or disappointment at being ignored. 
Despite the urgency, her plea for help fell on deaf ears.
Pro Tip 2/3Non-literal Use
Understanding that 'deaf ears' refers metaphorically to people who are intentionally not listening. 
The protesters felt their demands fell on deaf ears.
Pro Tip 3/3Informal Context
Best used in casual or informal situations, not in formal writing or speeches. 
I've told you not to play here, but it keeps falling on deaf ears.