Voucher not working

I upgraded to a Note 20 ultra in Sept 2020, registered for the promotion. I received a e-voucher and a sms confirming I qualify for the the voucher. I tried to use the code bur it did not work. After numerus phone calls the said their system is experiencing problems but do not know how long it will take to fix it. So I waited a month tried again but still did not work. Phoned again, they then told I do not qualify for the voucher. I told them I disagree as I have an mail and sms confirming my voucher. I was told to send my email and sms to *** to verify my claim. Its now December still nothing. Phoned again, they told my I do not qualify for the voucher. I think its very poor service from the to send a voucher only to say its invalid. I want my voucher!