https://www.desidime.com/deals/payzapp-2-offers-get-rs-50-shop-voucher-on-upi-transaction-rs-50-on-bill-payment-no-min-txn-value?page=2#post_9734421
After opening ticket second time and multiple calls from payzapp support, they finally gave voucher in the tickets section in app.
Just received 50 voucher coupon
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Offer is still active and valid till 31st October.
how to use this, not applying on apay
You have to redeem it on Payzapp>Gyftr. Apply the promo code in the GV page on Gyftr. Even though the SMS mentioned Amazon voucher I was able to redeem it for Flipkart GV.