fall on deaf ears
US /fɔl ɑn dɛf ɪrz/
UK /fɔl ɑn dɛf ɪrz/
1.
to be ignored or disregarded; to be heard but not acted upon
:
•
His warnings about the financial crisis fell on deaf ears.
•
The students' complaints about the unfair grading system fell on deaf ears.