Poor Service with product registration

The service Ive received from your Nespresso Club has really been disappointing. Ive been trying to register my machine with Nespresso for months now. Ive uploaded my serial number when trying to register and listed the purchase date of Aug 2015. I advised them that I bought the machine from Dion Wired and no longer have the proof of purchase as they dont exist anymore so I cant download the invoice. I do have proof on my bank statement where I made the purchase. They take weeks to respond to my emails. Every time they respond they ask for the same information which I have provided over and over again. Its getting really frustrating. The last response I received the lady advised that she just needs the serial number then she can issue me with my R600 welcome voucher. I sent it to them. Now she responded saying she didn’t get the serial number and asked for the proof of purchase again. Ive advised multiple times that I dont have the POP and have provided the serial number. I own 2 Nespresso machines and so far the service has not been that great. I tried to register the Innisia machine when I got it in 2015 but kept getting errors on the website. About a year later I visited a boutique and tried to register it in store but didnt have the serial number with me that day so couldn’t do it there. I just left it because it was such a hassle. I never received my welcome gift from Nespresso.