Advertise wrong flight costs

I tried to book from 5 different computers - every time they advertise a flight fee and when you actually want to book - the flight is miraculously more expensive - but if you change the computer - same thing- so they are actually lying about the price to get the client to do the whole booking and when it comes to payment - ooops now it costs a lot more - wonder how many people fall for it , because they get so irritated that they already spend hours filling all the forms in... What *****!!!!