Gyftr.com — Access denied error

Hi I bought vouchers of Gyftr through Indusind Bank of Rs. 10000/- when I open Gyftr website and enter my registered mobile number, then there is an error become Access denied. When I called customer care then didn't provide any resolution about this. Too much bad service of customer care. Firstly they assure you that it will resolve in 24-48 hours. But still same problem. No proper response and guidance.