Cheated by Gotogate

I have booked flight tickets for a Family vacation to Durban. Upon making my booking, I was sure to check my selection times as we wanted to spend the day in Durban on Friday as we have made bookings. Apparently, even though double checking this during the selection process, the Gotogate system changed the flight time on the confirmation page...which I did not notice. So yes, I am partly responsible for confirming the incorrect time but why on earth would the confirmation be different to the selection I made. I triple checked this to be sure I had the correct flights. So...I contact Gotogate to find out why this had changed...well...their answer was that the flight schedule changed while I was making the booking and so they gave me a morning flight. Again, yes, I failed to see the change but did not think the confirmation page would be different to what I selected. Why even ask clients to select flight times. Just booked them any time you like. Anyway, Gotogate now wants to charge me more than what I paid for the flights just to change the return time? REALLY? This is ****************. I feel cheated. This is ridiculous. They clearly need to have some sort of warning to clients if the confirmation is different to the selection made, so clients know to double check. I am sure I am not the first or last person to make this mistake and the service provider is not interested in assisting... If the flights requested are going to be changed, don't bother asking clients to pick their preferred flight. Just give them whatever you feel like and when they ask for help, charge them even more. What a wonderful service you have Gotogate. I hope you enjoy *****ing money from clients. Your customer service is ridiculous. Why even have it? You are not willing to help anyway.