Default [Q] .757 Speaker issues, what do I do?

Hello, yesterday I updated and re-updated the latest (at least for Argentina) KitKat firmware.

The problem is that I'm still getting the speaker issues, where the sound swaps from the speakers to the earphone and I can't really hear my
ringtone when someone is calling or the volume on different apps is just too low.

I'm quite new to Android and I've been lurking around the internet for hours but it seems the update did fix the speaker issue for every user. I feel like an alien and I do not know what to do.

Shall I re-install the update until it fixes or should I just go to the closest Sony Support in my city? Thank you very much sorry for being this rookie.

Also, I have my BootLoader Locked.