Samsungs lack of understanding vouchers and poor service

Samsung has really poor control of their vouchers and the system. I bought the s22 ultra and received an email saying I have a R2000 voucher, the only thing the email said was u need ti use the whole amount at once, as you will not get chance. There was no expiration, and no link to terms and conditions. So I go to use the voucher 3 mo the later and they tell me it has expired!!!! Legally it cannot as they haven't linked me to any document telling me when it expired there is zero information. Its seemed the only thing that they had to say was you will get no change for using it. They said they were having problems with their vouchers and now they are saying they believe I saw the terms and conditions and knee the expiation. Pathetic service. Absolutely *******. They are just a horrible company to deal with.