u/Good-Hippo3377

I know it's quite high pitched so may be tricky for all to hear - but this noise is driving me crazy and my landlord is unwilling to acknowledge it. They keep washing their hands of it and not doing any investigation.

Does anyone have any idea where the noise is coming from? It is NOTHING that I own. Ive turned off all my electrics etc. I can hear it mostly in my bedroom but it echoes throughout the flat and seemingly outside too.

Had my ears checked and no issues there. Also visitors to my property (usually aged under 40) can hear it.