Well, I was very busy and couldnt check again .. tried just now (at work), and OH NOOOO!!
error on the Vodacom4me website, yet it DID show account details of somebody totally unknown to me, living in Uitenhage ( I am at work in Kenilworth, Cape Town).
This time, I will keep a copy / paste of the detail in case nobody beleives me AGAIN.
-- Added later
OK this happened before, and there is something in common with the last time.
I have 2 different logins on Vodacom4me, one for my pre-paid and one for my hsdpa contract.
I OFTEN log in at work on the pre-paid one to make use of my 20 free sms's. It seems like if I DONT log out, but simply close the I.E. window, it will most of the time not log into my other login for several hours unless I log back into my pre-paid, log out, then log in again into the contract one. If I dont do it, it just shows a white screen with ..
some error writing (cant get it now). But sometimes it would show some error, then continue .. and log into someone elses account. Weird.