Samsung Voucher and Stock Availability ****

I have bought a fridge with a R6000 voucher. I planned on purchasing a dishwasher (DW60M5070FS) with this voucher. While submitting a Back in Stock alert multiple times, this has not worked. We have received emails at 2am in the morning numerous times saying stock is available and at 8am when reading this email and trying to purchase, the item was out of stock. Ideally I would like to make the purchase and I do not mind waiting for it to be sent to me when it becomes available again. I cannot understand how Samsung stores and numerous other stores have stock of this item but i cannot get it on the online store. I have sent numerous emails and contacted Samsung via telephone with no outcome. The emails for stock alerts being sent out at 2am is really quite outrageous unless Sales is doing this so their friends and family have the first option to purchase. This is the only reasoning I can derive from our experience. This voucher is soon reaching expiration. Being loyal Samsung customers with so many Samsung devices and appliances, we have reached a point where we are really frustrated with Samsung's Customer Service. This is our first time trying to purchase from Samsung Online and it has been the most painful Samsung experience.