FLYSAFAIR webset is rigged to rob you

Price of your Flysafair tickets where advertised for R699 onway. After going through the process to book two tickets and putting in payment details I was given an error message that said the ticket price had gone up to R749 without me selecting any extras, which forced me to re-book with the new price of R749. This is not much but feel this is still ****************. The system is rigged and should not push up the price when a person is halfway through the process of booking a ticket. But that is not all, when I check the price of the same tickets today, it is back to R699 which is exactly the same date and time. Why was I forced to book at an extra cost. If this is determined by your system then your system needs to be changed as it is designed to rob people.