Lying sales people from vodacom

In March I was contact by a sales person from Vodacom in connection with one of my contracts that they want to migrat to a Red some thing. After talking to the sales constultant and after asking her more the 3 times will I be paying more for this, and her answering 3 times no I agreed to the migration. On my April bank statement I saw that the took R170-00 more then what I usually pay. After cheking my Vodacom statment I saw that they are charging me more for this migration. I spoke to a Acona at the voice recording section and said that I did won and that some one will phone me with the correct contract. I also have a case nr for this and still no one has come back to me. Yet again this month the higher debit was taken from my account and I am not happy with the sales people of Vodacom lying to their clients.