Airtime converted to Data?

<p>I logged a call with Vodacom ***~SCR4 but still no feedback</p> <p> </p> <p>This is the call that I logged on 19 December 2016</p> <p> </p> <p>I bought R29 airtime on 17 December 2016, using FNB online – ***</p> <p> </p> <p>Then yesterday 18 December I saw that that my airtime was finished. I called Vodacom Customer care and the person told me that if my data is finished then my phone is going to use my airtime.</p> <p> </p> <p>This doesn’t make sense, airtime is voice and data is for internet\WhatsApp\Facebook…..</p> <p> </p> <p>Questions</p> <p> </p> <p>1. Why is my phone using my airtime when my data is finished?</p> <p>2. I don’t want it like that is must be separate on your system\network</p> <p> </p> <p>Can you please change it and let me know when it is done?</p>