I used a machine to make a booking. The machine did not work. I paid and the machine took my money.
Next time when trying to save a little. Try using a human. They are called travel agents and reservation clerks. Part of the extra charge is to help out when these situations happen.
You are angry at a COMPUTER PROGRAM it could care less how you feel. You tried to save money by doing it on your own. Most times it works. THIS TIME you pay the penalty for not using a human in the first place.
Not the answer you want but you are dealing with a COMPUTER PROGRAM. it took your money and you willingly gave it your money. The machine did not make a mistake. It does what it is PROGRAMMED to do. TAKE YOUR MONEY. The perils of CHEAP ,LOW COST, BARGAIN DAY,SALE PRICE, DISCOUNT,PAY LESS,NO FRILLS travel booking sites.
Sorry there is not a generic answer to your situation. Many websites,many different rules. If paid by credit card maybe your card company can help.
Part of cheap is NO REFUND
Part of paying more is changing your itinerary will low or no penalties.
Part of paying a little more comes with HUMAN to help you.