almost slept at the airport

On the 28th Nov , I booked a flight through travelstart around 5am in the morning from Port Elizabeth to Cape town. Fortunately for me I went to the airport very early, my flight was scheduled for 17h00. As I was self checking in, I discovered that I was unable to do so, I went to the counter to enquire and they saw that my ticket was not paid.i immediately contacted travelstart through an email that said the funds could not go through, I must resend the account number or contact my bank.it was around 11 , and the message was clearly indicated that I should not rebook the ticket as it might cause duplication. After a while I contacted travelstart and there was no response till I got hold of the emergency number where I struggled to get someone on the phone.later I was assisted by a rude person who first shouted at me, saying that there's nothing travelstart can do, I must go to the counters and buy the ticket myself. The ticket was R2007.12 but when I booked with travestart was 1400 , I had to pop out 600 more because of travelstart negligence, whereas if they have made it clear to me that they won't assist me, I could have gone to another agent. I'm disgusted