Misleading Promo advertised for 30% off voucher or technical issues

I received an e-mail on 17 January from Flysafair advertising "30% of the airfare back!" So I took advantage and booked a flight on the website and paid in full, following and meeting all the conditions for the promotion on the same day with my registered profile. I received my booking confirmation, receipt, boarding pass and Chubb baggage insurance info via email shortly after placing my booking and paying but did not receive anything regarding the voucher. Booking Receipt Email #4S7RB7 I assumed that the voucher would be e-mailed or added to my profile later on. This did not happen so I mailed support to query and received a response on 21 Jan 08:07AM saying that they will forward the issue to the IT department to query. I was then told that the voucher was sent via e-mail on 22 January, which I did not receive. Support then rep**** and said that they would escalate back to IT. I've made it clear that I received all other e-mails from Flysafair with no issues and there was nothing in my Spam folder etc. and to please forward me the voucher if it was indeed sent or send me a screenshot to see if it was sent to the incorrect e-mail address. I have not yet received a reply since. I find that this was very misleading as I was enticed to book my flight on the day of the promotion and comp**** with all the rules. It is sad as I always had positive experiences with Flysafair till now and always had good things to say about the company in the past. I hope that this mishap can be resolved ASAP.