RAW DEAL FROM VODACOM

My home internet was upgraded without my permission by the Vodacom Benoni branch and when I called to enquire they said they would investigate and provide me with the the recordings where I approved the upgrade. I spoke to Nomvula and to date nothing. I am now stranded as that internet connects my home security system and I keep having to buy 10Gig data @R149 when in the past my DATA had been enough. No call, no explanation, nothing..........please assist me urgently and take back the contract to what it was.