I am a prepaid customer.
* I bought a 3 Gig once-off data bundle 15 April, expires 15 May
* 1 May, my 2G bundle, expiring 1 July, is activated, 1.5G left on bundle above
* Data now comes off the 2G bundle, and my 1.5G data will expire unused, 15 May
* I will run out of data this month, and...