Did you buy the 3GB or did you top up by that amount of money? I managed to top up once by mistake, and then had to go through the same screens to "buy" the data allowance for the same amount, for it to use the top up.
They apparently do this so you can roam (non Feel-at-home countries) and use the credit for SMS etc.
plusnet unlimited fibre
- 2 Jun 14 - 470m - 80/20 - Summer/dry sync 55/9.4, Winter/wet sync 52/9.1
15 years broadband (1999 ntl:cable trial) - Asus RT-AC68U with HG612 - BQM - Summer PN speed - Winter PN speed