Samsung — Refrigerator service refund coupon

I purchased a Samsung refrigerator from croma. Refrigerator has some issues with it so I registered a complaint to get it fixed. Samsung took the refrigerator and gave me refund vouchers. Now when I am trying to get the copan redeem, their site is not working. For last 2 weeks, I don’t have a refrigerator and all they say is our technical team is working to get the site fixed. I am not sure what to do, it is a mental harassment. Their product was faulty and now their site is not working and I am suffering. Please suggest what to do.