Because of your website issue, I now have to pay more for tickets

About 2 weeks ago, I was attempting to book tickets via your website using my vitality info. at that time, the tickets were priced at R700 for a flight from OR Tambo to PE. When i got to the payment screen, it kept on saying that there was a payment error and I must check the details again. After numerous attempts, I called the call centre, only to be told that I shouldnt use Google Chrome, but rather Internet Explorer. Still that never help. As time passed pay, Your price in tickets have shot up in price, now those same flights are R813 and R847, which for me is not acceptable. Still this morning i try to book the tickets again, and it is giving the same error, I called the call centre again, and I spoke to Anisa, who did her best to try and help me, but she too was getting the error i have been getting. This is unacceptable, as because of your stupid website, i now have to pay R400 more for the tickets, where as if your website was fine, my tickets would have been booked at the best price. Please can you rectify, and I am wanting to pay the price i had 2 weeks ago, even though you have the error. This is not cool