Hi Adr3,
This is Froso from Viva.gr. We stumbled upon your post and are really sorry for your frustration. We have sent you a PM asking for more information about your issue. Maybe searching our logs we can find out what went wrong. We can assure you, however, that we never intentionally change the prices from one page to the next. However, flight prices change very often by airlines, and the automated systems that we use to get them are updated real time. That means that if you stay for too long on one page, it is possible that in the meantime the airline has sent us an updated price, which is what we will show on the next.
Hope this clears up the confusion, and we are really eager to hear more from you so we can pinpoint the exact situation.
All our best,
Viva.gr