Mango airlines.

Booked fligjr to George to fly at 08:15. Mango without excuses changed time to 12:55 day before flight. I had set up meetings for the morning.. Got flight on Flysa for 0:600.mango refuses a refund, and offered voucher to be used within 3months or forfeit to money. This is *****, theft. I am not able to use within 3or for that matter in 12 month's. Pleade help