New LG G2

[lexfrancis]

I just bought a G2, i'm having trouble with notification sounds. I set the notification sound to something other than that annoying choir boys one. So receipt of texts, emails etc. give me the notification sounds I set them to. However, every time I call or text someone, I get a notification window from giffgaff showing my remaining balance/minutes/texts, and for some reason I still get the choir boys' "life is good" along with that. Same thing happens when I request remaining minutes from giffgaff. It's really irritating, does anyone know how to change it?