No booking confirmation - site unresponsive - charged for Flight.

I booked a flight on Friday (17/08/2018) - but received no order confirmation from Mango and an error message saying booking was not completed. Thereafter Mango's website was off for several hours so I was forced to book with another airline. After my arrival in Cape Town I tried to make a booking on Mango for the return flight on the Sunday and I received a message to say that I am already booked on that flight.

I then realised my booking had been 'completed' but I received no confirmation or booking number.

I have contacted the refunds department by phone (after holding on for 45minutes) they told me to send and email to ********** with my reference number - which I have done THREE times. Without response or acknowledgement of my request.

I am extremely unhappy as this is all, especially the fact that my request is going unacknowledged.