Settlement amount

Last week I contacted Vodacom customer to cancel an account which I do not use. I get hold of an agent who seemed to be professional and attended to my every request. I asked for the settlement amount for the cell contract and received an amount of R1410.70 for the cancellation of the contract. The agent advised that I would need to pay the money at a vodacom store and then call the cancellations department to confirm payment and closed the account. At this point I was eager to close the account and was in a good financial position to pay the R1410.70. I went to the vodacom store on Picbel Parkade Strand street and paid the amount and received a receipt. I call back the Cancellations department to finalize the cancellation. This is where my anger starts. The agent checks and sees the payment, asks me where is the quote. I'm clueless at this stage. They send me a quote 2 days later with an amount of R3009.62. I refuse to pay this amount. Vodacom needs to sort out staff skills. I want this account cancelled as I was told. I don't care if you have to take it from the initial agents salary. No one told me about quotes until after the payment had been made.