Voucher STILL not received!!

My husband and I bought a Samsung fridge in November 2017 and received a Samsung voucher to receive a voucher worth R4000 that can be retrieved for either Uber, hotel bookings, but trip or airline tickets. I called them in January to say I want to redeem the voucher for uber. I was told to email through a copy of my ID and a form which I did. the guy I spoke to said I would get feedback uber voucher as soon as they get my email. Called the next day and was told it would take 10 days. I called them yesterday and a lady told me it was sent by SMS on the 25th, I didn't receive anything. She said she will ask her manager to resend it via email before end of business. Woke up this morning and still no email!!! It is absolutely appalling that I have to keep calling them to do a follow up. When will I get the email? When will you give me the voucher that you promised? I need feedback on this before the end of the day!!!