Received an error while booking a ticket online bu

I tried booking a bus ticket from Johannesburg to Cape Town on computicket on 21 Jan 2015 (City to city) for R550.00. When trying to confirm the payment via the credit card I received an error saying that the transaction was unsuccessful. When we received our credit card statement it shows that the payment went off our account. I never claimed for the ticket as the transaction said it was unsuccessful. <br> Another ticket was booked and paid for in cash.<br> I queried this with computicket via email and were given many reasons why they cant reverse the transaction.<br> I often book tickets online using Computicket and have never had this problem before.<br> I just feel that this is an injustice done to me and will never make use of this online service again<br> <br>