u/Deadlocked00

Every time i have ANC turned on there's this really annoying humming in the right earbud. At first i thought it was the usual: dirty mic or my dirty ear, but even after thorough cleaning of everything the freaking humming is still there! I even sent the buds to the service center and they said it passed complete testing with no issue! I don't know what to do now, thanks for any tips.