Tata Sky — Giving the customers expired promo vouchers

Address:

Lucknow, Uttar Pradesh

I had recharged my tata sky online, where tata sky offers cust. Some complimentary gift vouchers i had option to chose among the voucher, i chose amazon discount voucher, which when i tried to redeem on amazon in my purchase they told me that tata sky had given you expired voucher, when i write this to tata sky they are trying to evade me. Not responding to my mails.