Myntra.com — gift cards bought in bulk from myntra expired before expiry date

Address: Spice Board office, Six mile, Behind PNB bank, G S road, 781022

I bought Myntra gift cards for my company in bulk last and they were supposed to expire on 6th May but while trying to use them on the last date of expiry, Myntra website displayed that the voucher already expired a day before. I sent an email to the concerned person at Myntra a month back and there is still no response from them. Please help close the issue at the earliest