TDS demand & settlement related discussion was through official IndusInd email channels, on call they just intimated about winning the contest & about applicable TDS due to gift value higher than 10000rs which need to be paid to claim the Gold voucher.
Also for payment of TDS, they had shared official account of IndusInd to transfer the 30% of actual Gold value as TDS. So everything was checked by me before making the payment 🙂