Out-of-bundle data charges without notification

<p>I received a nasty surprise when my debit order to Vodacom went off this month due to out-of-bundle data charges on a data contract.</p> <p>I heard this morning that this is an open-contract and not a top-up. That is why it went over. This is a number that cannot receive sms's so I never received a warning about the out-of-bundle charges as with my other contracts. This is unacceptable!</p>