WHAT HAS HAPPENED TO MANGO AIRLINES GOOD SERVICE

BOOKED FLIGHTS TO CAPE TOWN FOR EASTER WEEKEND. PRE PAID FOR BOOKING SEATS THERE AND BACK. WHEN I RETURNED TO JOHANNESBURG ON EASTER SUNDAY I WAS UNABLE TO SIT IN THE SEATS THAT I HAD BOOKED AND PAID FOR. WHEN QUERYING THIS UPON CHECK IN I WAS TOLD THAT THESE SEATS BELONGED TO SOMEONE ELSE. HOW CAN THAT BE IF I RECEIVED AND STILL HAVE CONFIRMATION THAT THESE WERE PAID FOR. HAVE EMAILED MANGO BUT THEY ARE IGNORING MY REQUEST TO REFUND MY MONEY PAID. THIS IS NOT ABOUT THE MONEY BUT PRINCIPAL AND IGNORING CUSTOMERS. NOT EVEN GOING TO GO INTO THE DELAYS THAT WE EXPERIENCED WITH OUR FLIGHTS