Reliance Trends — voucher issue

Address:

Bangalore, Karnataka

I have received 2 gift vouchers from HDFC Bank as part of credit card points redumption. When I wanted to redeem the 2 gift vouchers of Rs.500/-, the Reliance Trends shop which is in 4th Block Jayanagar Bangalore, refused to redeem one of the vouchers. They claim that the voucher which I received from HDFC Bank cannot be redeemed as it is already redeemed. I don't know the reason why the people are saying that? They redeemed one voucher of Rs500/- and another they are not ready to take.They are asking me to go to the issuing Branch, which is far from my place. (Richmond Road Branch) voucher no is [protected]. Please address the issue, as I have not claimed the voucher.