Ammendments of booking

I called in at intercape customer care to make changes on my booking. Simphiwe advised me that I will néed to pay a fee of R54 to make changes. I than advised him that I will call back as I didn't have my card with me. He advised that I have until 20:45 to make changes. I called in at 20:00 to make changes and I'm now advised that the change will cost me R165. I requested to speak to a manager because no one had explained to me that the price that simphiwe advised was subject to change. Requested to speak to a supervisor.. The agent said the supervisor will have to listen to the call and callback. Yes he did call back Miguel however he couldn't help me because I didn't have the R165. I told him that he had to do something as it was the agents fault and I had R100 only on my account. The supervisor was not helpful and advised that I have forfeited my ticket.