airtime vanished into thin air

good day !<br> <br> my vodaco number is ***.<br> today the 31st march 2016 i had 34mb in my account.<br> i was busy with some customers and went to buy data bundles. i was going to convert my airtime which was r150 to 1 gig data , and it was not there!<br> <br> when i called in customer services, they told me because my data was finished, it took about 10minutes to consume r150 rands worth of air time..<br> <br> this is highly unacceptable, as i budgeted for this, now i have to inconvenience myself and go and fish for another r150 to do the same process.<br> <br> please, its unfair , dont rip us off, if the data is finished , it is not supposed to come out of the customers airtime, because it works out extremely expensive !!!*******f !vodacom!!!