Zero customer care and no refund but charged 4 times

Extremely disappointed with zero customer care and no refund. My flight that was booked and paid for (for 2 people) was changed by Mango, that part was fine but the time they changed it to was not a convenient time. So I tried to pay for a flight change, mango charged me 4 times! But did not actually issue a new flight. So while trying to sort out the admin at the desk, we missed the flight and had to buy 2 whole new tickets. I went to the counter at the airport to query a refund for the flight change fee (charged 4 times!) and was turned away. No response to calls or emails. I see no response by mango to people here either. They simply don’t care about customer service. I will never fly with them again