Expedia bills me after cancelling the flight

I'm struggling to get through to anyone at Expedia.<br> <br> I booked a ticket yesterday evening on Expedia for a flight from Cape Town to Barcelona for US$ 2,315 (at approx. 5:45pm GMT+2)<br> <br> Later that might, at 8:22pm GMT+2, I was sent an email from [Email Removed] saying: <br> <br> \Purchase: *** has been cancelled due to one or more of the following reasons:<br> <br> o We were unable to authenticate the credit card.<br> o We were unable to authenticate the card holder.<br> o The purchase was declined by the credit card company ...".<br> <br> I sent several emails to [Email Removed] asking for an explanation"