Magicpin — I have received already redeemed voucher

I am buying an amazon shopping voucher worth 10000 on 17/10/2024, but I have received already redeemed voucher. When I complain, I have received an email where a reference number [protected] given.
when I contact to gift card issuer QwikSilver customer service through this reference number they say the voucher is buy in 2023, but I am buying this voucher on 17/10/2024.
I want a refund of my amount.
I have complained many times, but I have not received a response.