Welcome to the club 😀... 2 months ago i tried every possible way to get these alerts stopped-their twitter help, emails, phone calls.... but absolutely NO luck at all. Fiddled with every setting in my phone (2700c) but NO 🙁 🙁 their technical team said there is no such setting at their end to stop these for a subscriber on prepaid.
*BUT* for 48 hours during the time i was nagging them, the alerts did stop (damn it was like mobile heaven!) but they just started again. when i asked them how was it that they did stop, they said it might be because of connectivity issues.
and what is even more irritating is that with the free sms pack these don't even have any use even for those who do want to know their balance...
now as a direct consequence of these alerts i have just stopped messaging altogether... nice job vodafone 😛