billed for a higher amount

I have recently talked to Collection Bureau of America and an amount of $57.84 was agreed on as the total that was to be taken from my bank account. When I received my statement they had taken and amount of $65.83. Before I hung up I specifically ask that the total to be billed was $ 57.84 and they said yes. When I called back they said there was an additional fee. They were to send me a breakdown of the total cost and they have not done it.