Missing data (or excessive data costs)

This is more than one instant where somehow, I loose a large amount of data and I can’t explain it. And no it’s not downloads or app updates or software updates. I monitor my data use very closely. I’ve called the Vodacom customer service on various occasions and they seem clueless as to the reasons for this. They always claim that they’ll call me back and never do. After being a Vodacom client for more than 10years, I’ve just about had it. The consumers are being taken for a ride. It’s equally insulting for Vodacom to have promotions which offer a few free megs of data but also disappear in a minute. SA is in dire need of a cost effective cellphone network provider.