no response after a month

I emailed mango and got no reply. I then called their call centre numerous tmes which has not helped. <br> <br> I contacted mango regarding a voucher I was promised due to the long delay on the 18:30 flight to jhb on 2 January 2015. (Ref number MFRZTF)<br> <br> The customer representative let me know I would receive a voucher within 48 hours of R250 to be used within 3 months. All I got was a blank email with no voucher number. I wanna book a return flight and need the voucher to be sent correctly.<br> <br> L Tselane