Vodacom *****s airtime

I bought airtime, and before I can send the SMS I bought the airtime for, the airtime was gone. I checked if I had any subscriptions on my number and there were zero. I contracted Vodacom and they couldn't give me a straight answer. Just told me to stop all subscriptions. I showed them I had none. They told I need to put my out of data bundle at zero, I did that even though I use WiFi and mobile data is always off. After that, I buy airtime again, and same thing happens and they tell me on their side it shows that it's out of data bundle thing. How when they said I must put it at zero? And how when my mobile data is off? When I asked them to explain how come Vodacom chows airtime and says it's data, while the mobile data option is off and only WiFi is being used, they only said "our responses remains the same." Never buying Vodacom data again. I'll be migrating to cellc.