phone contract (vodacom)

on the 02/12/2014 i made a new contract with game for a new phone ,i bought the phone for my daughter as a present.present. Zodwa dealer ID no:Go62z helped me at game .i did informed her that this phone is going to be used by my daughter(cell phone no:***) ,i want it to be a top up phone. she told me that the top up contract will start the same day i took the phone .on the 26/12/2015 vodacom charged me R5286.16(for data bundles only no call was made ) then i went to vodacom shop they told me that my phone was still on open contract not on top up , the papers for the contract says i am on top up . after i went to Zodwa the lady helped me ,she was surprised about the account .she even shows me a limit from my open contract that is R1200 ,now why such a big amount.she tried to call vodacom account office .they told her that i must pay the whole amount , she called her senior ,her senior also spoke to them .they gave her an advise that they must write letter to negotiate a discount .that was done, on the 1st february Zodwa phoned me and told me that they said i must pay .so now i am sitting with this amount of money because of someone 's mistake. I NEED YOUR HELP PLEASE .<br>