Never agreed

I phoned this afternoon to upgrade my husbands phone, we initially never upgraded because we were happy with our contracts and had no need to upgrade. I contacted vodacom February because i wanted to cancel my husbands contract off of my name and the free promo sim which was given to us as well. When i spoke to a gentleman at vodacom he suggested we dont cancel my husbands number off of my contract but rather let it run still month to month and have a amount of R65.00 airtime debited so we still have the line open but can upgrade when ever we want to... So this afternoon i needed to upgrade his phone because it has crashed I cannot upgrade because apparently I upgraded to R65.00 per month WHAT that is not the conversation i had with the guy from wanting to cancel the contract to upgrading to R65.00 a month with no hand set... come on.