Lack of response

On 9 January 2016 my flight from Port Elizabeth to Johannesburg was delayed by around 3 hours. The following day I received an sms from Mango advising that they would issue me with a voucher; the sms contained a telephone number that I had to call. I duly called during that week and was told that a voucher to the value of R250 would be sent to me via email. About a week and a half later I had still not received the voucher, so I called again. This time I was told that there was a backlog and that the voucher would be sent in about 2 days. I have STILL not received said voucher. I have posted on the Mango Facebook page and received a response that it would be taken up with customer services. A few days later I received an email from Mango, the subject line of which said \voucher\". However, the email contained no contents and no attachment - basically, a blank email. My subsequent postings on the Mango Facebook page have gone unheeded. And to date I STILL do not have the voucher. I believe that they hope customers will eventually just give up. They hope that customers will be placated by the promise of a voucher but they have no intention of actually giving out any vouchers."