Hypercity — not able to use gift voucher

Address: Gautam Buddh Nagar, Uttar Pradesh, 201301

Dear sir, i have bought a gift card (Rs 1000) of hypercity from amazon.in. The hypercity company is acquired by big bazaar. I contacted big bazaar to use that voucher but they denied to accept it.
I tried to contact hypercity but their helpline no is not working.

Now my money is wasted just because big bazaar buy hypercity. If a company is buying another company it is not only buying assets but also liabilities. I should be able to use my money at big bazaar/ hypercity or my money should be refunded.
Please help to resolve my issue.

Regards
Manish bansal
[protected]
Manish. [protected]@outlook.com