Upgraded without consent

My wife has been contacted by the call centre offering her an upgrade, the lady on the phone was so fast in confirming things that she didn't even realise that my wife said no to the upgrade.

A day or 2 later ram calls and delivers 2 mobile phones. we immediately called vodacom saying we did not want this, we were advised they will come and collect the phones.

7 days later no phones has been collected, we called again on the 29 august and was informed by vodacom that they will collect within 2 days. Over the weekend my wife received a message saying that he new package is active! Vodacom has still not collected the phones it is still sealed.

How can vodacom just send out mobiles that was not requested!