Data and airtime disappearing!!!!

I have loaded a total of 3x R29 airtime and 5x 100mb data this morning. within seconds after recharging I get an sms telling me that my data is depleted. <br> no applications are running, all applications are disabled, cellular data on my phone is disabled. no applications can run. <br> but my data and airtime still disappear within seconds. <br> i'm not making any calls, no applications are running. I check my balance now and I have 100mb data, and R29 airtime, I check my balance immediately again and im down to 45mb data and R14.99 airtime. even though no applications are running, no calls are made, no sms's sent, I lose 55mb data and R14.01 airtime in 10seconds. HOW IS THIS POSSIBLE VODACOM???? WHY ARE YOU *****ING MY AIRTIME AND DATA QUICKER THAN I AM ABLE TO RECHARGE?????