faulty earpiece

faulty earpiece

ive got a 6 month old nexus 5 x and when someone on the other end talks the earpiece buzzes. it sounds like the earpiece is blown. only time it stops is when the volume is down to 30%. ive tried changing the earpiece with one i got off ebay but its exactly the same. anyone else had this problem? i dont really want to send it back to the company i bought it from (eglobal central) as the reviews of their customer service is terrible