On my last billing cycle I instigated a 1gb data plan as I would be away on holiday and wanted to use my phone as modem, all worked well. I was in a somewhat remote part of Coromandel and got excellent 3g by the way.
On my return I cancelled the monthly roll-over of the 1gb account and asked  to be  reverted to the 100mb account. I did this on the 1st day of my billing cycle, big mistake! It should have been done on the last day of the old month.
Now, I accept that it was my mistake and Vodafone has charged me for a new month of the 1gb plan but guess this, they still cancelled it as per my request and dropped it back to 100mb.
I rang and said would they either credit the charge or supply me with the 1gb data but they refused so I have had to pay for something I will not get.
I have been with VF for years, always keep my account in CREDIT.
I put up with lousy 2g reception and no 3 g reception.
Now this.
:-(