Big Bazaar / Futurebazaar / Future Retail / Hometown — Money blocked in the wallet

I was ordering grocery worth INR 1051 from the big bazar app. I was given a INR 100 as credit in the wallet as a promotional offer. I added another INR 951 in the future pay wallet so that i could complete the payment for my order.

While placing the order and clicking on the payment through wallet i was unable to use the money in the wallet that I transferred . It said payment cannot be made through this please use another mode. On repeated attempts the error shown was the same.

Further, i tried raising a grievance on the app but there was no response. Also, i tried calling them but no one was there was a customer resolution. I think the number on their website is just for dummy purposes.
I also tried to review their app on apple store, while doing so i see that there a quite few people with the same complaint.

I request you to help me find a resolution so that i get my money back and also that they dont cheat other customers like this.