Dial91 India calling app not working, no refund made

I recharged my dial91 account “rxxxxxx9” with an amount of USD 10.50. This is an India calling app . But this app is not working at all, i couldn’t use my balance. I want either to use my balance or refund.
I tried to contact dial91 customer care they always says try after some time. They also suggested to check with latest android version phone as my android version is 5.0.1, tried the same but getting the same problem.
Generally this app works once in a month. Attached the mail conversation, please help to get my amount refunded.

Subhani Mehboob Shaik
Hyderabad, Telangana
Email: sxxxxxxxx1@gmail.com