Vodacom ****s me for upgrade

After long consideration i decided to renew my contract to the R199 per month and get the iphone 5s. The consultant at Gateway said he will take care of everything and i just needed to come in and sign the contract which is what i did. He said that if anything goes wrong with the phone within 7 days i must come in for a straight swap within 7 days as i was reluctant to take the phone. The phone stared giving me problems so i though maybe i just dont know how to use the phone and took it to the customer service and repair shop in gateway. They looked at it and then said that it is within the 7 days and that i should take it back to the consultant to swap. I walked back to the vodacom shop and was told that the consultant was only going to be in today. I just phoned and was told he is not there and that whatever i was told is not right and that the phone has to be taken in and will take 7 days. I then said that i am in the 7 day cooling period and for that i will bring the phone in and they must cancell the contract hich will only take effect on 31/12/2015. I was told that i signed that right away and rep**** that i was not given the opportunity to read nor was it explained