Contract Terms not honoured

<p>I was enticed to remain with vodacom when my contract expired by an offer for an additional 500mb of data pm. This was fine for the first month but for every subsequent month, i have had to phone the call centre for them to add it to my account. At least 30min per call always with a promise of someone to call me back to sort it out! Yet to receive any of these calls. The last promise was that Simon from the back office (retentions). I give up trying to work through their call centres!</p>