HappyEasyGo — took more money

We 3 friends booked flight ticket together.1ticket got confirm. Other 2 payment done got a call from happyeasygo that your ticket will be issued in 1hr.. But again i got mail that price has been increased i need to pay extra or cancel. Then i paid extra again but they are not giving choice for airlines. Im able to see flight in there app but they are telling me it's not available.. Finally end up paying more and all are in different flights now. I need a solution for this