Big Bazaar / Futurebazaar / Future Retail / Hometown — Not accepted the e-voucher

We have received the e-voucher from my company which is valid until[protected], but they denied to accept when I went to redeem the voucher.

The store executives told me that big bazaar had been sold to reliance and they refused to take my e-voucher, I didn't aware about the sold one, but I have more than 6 months validity time. Please help me to sort out my problem!