Myntra.com — Gift voucher expired before time

I have bought gift voucher where it was written expirey date is 7/1/2023.
but when I was ordering product on 11/6/2022 with that voucher it showed voucher code expired I complain customer care regarding this after 1 weak they reply that voucher code has expired 1 month after purchase. any where there was nor written that voucher code will expire within one month.