Flight Booster - Cash Back Rewards

A number of months ago (Nearly 8 months or so), I decided to boost a flight with Discovery Vitality benefits, I did this for the first time, naturally I followed all the steps, and reviewed my progress on the application from Discovery, all was well and I received a projected date of 18/12/2017, a week and a half ago already. Seeing that I did not receive anything in my bank account in accordance with the amount that was projected, I called Discovery's call centre on 22 December 2017, I was made to hold the line for around 10-15 minutes and then I had to drop the line, as the call was made at my own cost, I called back minutes later, at which point, they referred the issue to a supervisor, all in all it took about 45 minutes for them to tell me, the cash back was calculated and would be paid out by Monday, come Monday, Tuesday and Wednesday, still no payment, so I call again, they tell me they have now escalated it (Fezile - Ref no: ********** 703) he mentioned somebody would contact me to let me know what was happening....24 hours later nothing, so I call again, this time the person on the line tells me, that they are escalating the issue and that it would take a number of working days 3-5 for the cash back team to respond, according to them I must wait until 5 January until I can get a response(NOT the CASH BACK, JUST A RESPONSE!) that's 25 days away from the original projected date for cash back.....In my world, this kind of service is not only unacceptable, but it's down right disrespectful to loyal customers.....Discovery shows no care to respond to issues from their customers, and by the looks of it, finds it difficult to make good on expectations they build up in consumers eyes, (The APP gave me the date in writing) why mention it, if you will not honour it?!