Airtime used while trying to convert it to data

<p>I have a data contract using a 3G ****le. The contract is on the same account as my main number. For some reason the app wont allow me to buy data for this ****le and adding the purchase to my monhtly invoice. The only option I have is to buy airtime from my banking app and then convert the airtime to data when purchasing a bundle on the app. This is already a stupid system as i have a data contract which cant be used to make voice calls, so why would i buy airtime on this data contract?</p> <p> </p> <p>This evening i purchased R289 worth of airtime. The balance showed as R289 Whe i tried to use it to buy data on the app. I got an error message that the purchase could not be verified. When i tried to convert the airtime 20 minutes later...my balance was R199 without using anything....when I spoke to the call centre and asked to give me my 5GB data which i tried to purchase, the lasy told me that the balance, which was now only R172, was not sufficient. 30 minutes later and R120 disappeared from my account. These cellphone companies are selling data at ludicrous prices to the public with no real alternatives. </p>