Gone in 10seconds

I recharged my Vodacom sim on Saturday Morning with R12 airtime and within 15 seconds it was \depleted"before I could convert it to data! The message received from vodacom is a balance of \""0.00\""! I did the same thing on Sunday night at around 9pm - this time I turned off 'Mobile Data\"" on my device thinking that the previous days R12 depletion in 15seconds should not repeat itself - what do you know - gone in 10 seconds! Balance refused to update"