Hi! When I try to book flights via the Turkish Airlines website, the prices always go up significantly during the booking process after I have entered my personal details. It doesn't matter which flight or when I try. Then if I search again the prices are back down until again right after I have filled in my personal details. I have tried dozens of times over several weeks. I am not selecting any additional services. It is literally the "base fare" that goes up. External travel agencies let me book with the lower prices. I have contacted customer service 4 times but they are useless. Does anyone have the same issue? Any idea what is going on?