Not truthfully when I upgraded

I asked if and to what phone I can upgrade. A LG and Samsung was presented to me. At the end I've taken the Samsung with a tablet that was on special. And now I'm paying R430 per month for the Samsung after I was told that's what I can upgrade to. So the employee told lies to me and Vodacom just up their shoulders. That is not acceptable that people are not truthfull and I must pay for their untruthfullness.