out of bundle charges before bundle ran out.

This has happened to me a couple of times...<br> I buy data bundles because it is WAY WAY cheaper than out of bundle rates. However, Vodacom starts charging me out of bundle rates before my bundle is depleted!!! I get charged R2 per meg (I think) before my data that I bought has been depleted... and only after I realise that my airtime is now finished... I get a message saying I've got 4mb left on my account. Had I received the message earlier, I would have bought a new bundle!<br> now I'm out of airtime and I have 2mb left. *** vodacom, ***!