Cheq had sent me this message and refunded my chips used to redeem prime voucher and took the voucher back.
Hi, we noticed that there was an issue with the Amazon vouchers you redeemed. We have initiated a refund of 1499 CheQ Chips that you will recieve in the next 3-6 hours.
As a token of apology for the inconvenience, we are crediting an additional 50 CheQ Chips to your account. We assure you that your future experiences of redeeming CheQ Chips will be seamless & rewarding. Thank you for your patience!
This is not good service from the company. They don't seem to be loyal enough to the customers. Even during the referral bonus credit, they were stingy and kept giving one reason or the other for the referral being invalid. Better to redeem the vouchers you have before they take them back and credit the chips to your account.