Data disappearing

<p>Yesterday I bought a 1G data bundle (14 day) for R99. I still had 56mb left on another data bundle which expired at midnight. This morning I put my phone on and as I do nowdays, I check my balance. Zero data. So 1G of data vanished into thin air whilst I was sleeping. This is not the first time. It's happened so many times that I'm wondering what I'm still doing with Vodacom. But believe me, this is definitely the last straw. </p>