Forced upgrade

I received a call from a Vodacom sales person regarding 2 of my contract numbers, telling me that the airtime will be increased on the contracts and the cost will be the same. She never stated that it is upgrades on the contracts. I could barely hear half of what she said. I received sms a couple of days later stating that the contracts is upgraded and will now cost R70 more a month. I immediately called to cancel the upgrades. The agent confirmed that the upgrades will be canceled not to worry. 3 calls later and the upgrades has still not been reversed.

I am extremely unhappy about this and am seriously considering canceling and switch to another provider.