Hi. It seems that Spotify is accumulating data as the data size was around 100mb to begin with and has grown to 600mb of data and I don't know how this is happening on my iPhone. It can't be downloading tracks for off-line listening as I've turned Airplane mode on and those regular tracks of mine won't play and I get the message to say I am off-line and need to connect to the internet. Does anyone know why this is happening?