This happened twice with me
After charging my card and giving me confirmation, next day they called and wanted to charge me more giving me silly (Oh the airline increased the fare) I even called the airline personally myself, they said I have to deal with the agency that did my booking
The agent at book my travel was literally pressuring me if I did not agree to paying more he was ready to cancel my booking, I even asked to speak to the manager, the Assistant told me they have No manager available, and have to decide ASAP … after having confirmation, they want to rip people worst site please do not do business with them