Samsung pre-order gift is a ****

Samsung pre-order gift is a ****. I pre-ordered a Samsung note 20 in september 2020 and part of the deal was I would get a R4000 voucher. I sent all documents required and after back and fourth on what documents need to be sent. They finally sent me the voucher. But they sent the wrong voucher and that voucher wasnt even working on the store. After numerous emails and phone calls, all they always say when you call or email is that they are escalating the matter. And no one will get back to me after that. This is the worst service ive seen