Upgrade on my contract

I called Vodacom on the 20th Dec 2017 and asked if I could upgrade before Jan, the women said yes sure I asked is there a fee she said no at all. Great I said let's continue, after the call I even received some of my data and I was told someone would call in 24 to 48hrs, needles to say no one called so I called this morning 23 Dec 2017, I was told that I could not upgrade and that if I wanted to I needed to pay a fee! Plus the phone I wanted is out of stock (which is the normal case with Vodacom) but I was told there is a phone for me. The guy who helped me said he does not know why this woke gave me the wrong information, he said he will phone me back on Wed morning. How ever I am not impressed I have to pay now when I was told I don't have to and now i have to wait even longer to see if I can upgrade. Unhappy Vodacom customer