Disappointment with Nedbank Greenbacks

Good Day All. On the 15th of May I app**** for 2 gift vouchers using the very poor Rewards Programme, GreenBacks. After numerous, phone calls and being provided 4 different reference numbers, I still have not received the vouchers as at 16 October. It surely does not take 5 months to email gift vouchers! What is shocking that the onus is always on me to call them to find out what is going, and every person that I speak to tells me the same thing. The vouchers will be emailed in a few days and someone from Nedbank will call me to follow up. This has not happened once! It is no wonder they are no longer a Top 4 bank...