Tired of being told untruthfull stories

i went to the store with my previous upgrade earlier this year and i asked about my other upgrades thee told me in December they can help me with an upgrade with my other contract ,About two weeks ago i called into MTN and inquired about my upgrade that is shortly due so the told me the 1 st of December is the upgrade due,so this morning again i called in to confirm my upgrade date now they tell me i'm only due for an upgrade next year in February 2016 SO WHO IS ACTUALLY WORKING AT MTN AND WHO IS NOT I THINK THIS IS UNACCEPTABLE AND UNFAIR TO CLIENT BEING TOLD TWO DIFFERENT STORIES even my insurance got cancelled without me be informed and it was paid up to date.