Welcome to Internet in Australia and Peak/Off Peak periods.
I myself am with TPG also, love 'em, but whilst I should be receiving 20Mbps - My best has been 7Mbps and the common average is 3-4Mbps.
I know the many, many factors that contribute to those speeds and unfortunately, until we can get off of these archaic copper networks we'll essentially have to lump it.
My suggestion, as like Dkaris and Tron07, would be to contact TPG either directly by phone or via the Whirlpool forums.![]()