No earpiece volume

[Guest gavin.19]

Brand new Y300 from Carphone Warehouse. It was actually a refund-swap for a Lumia 520 that a relative bought but then decided against. Anyway, I ended up getting the Y300 for £50 new and I was glad since I'd been clinging to my ZTE Skate for too long.

One major problem I didn't notice until I got it home was that there is NO earpiece volume on calls (or any time I assume). Loudspeaker works fine, headphones do too. I tried an app that lets you pipe the audio to different outputs but the earpiece is still nil. On a couple of incoming calls I did hear 1-2 seconds of audio, half a 'Hello', then nothing until I switched to speaker.

I have the receipt, so it's not a problem to make a return, just a pain. Thanks in advance for any suggestions.