Airtime disapearing

<p>This is the second time happening from the same network, I have a top up contract sim with vodacom i get R110 and 500meg on that sim and i dont even use the sim. Today i decided to insert the sim card and convert my airtime to data as i need to connect to the internet for a while. To my suprise i only have R33 left without using the airtime. I have another prepaid number with Vodacom same thing happened 2 weeks back. And i also use Cell C i never expirience such on that sim. number in question is ********** 030 you can contact me on ********** 766 logged this on the 1st this no feedback</p>