Thanks for the useful information added about the .com sale and the mobile recharge business.
Considering these information I would lower my estimation. Anyway IMHO I still think that the domain could sell for mid-high xxxx USD or even high xxxx USD/very low xx,xxx USD to the right buyer (if there are not trademark issues with .com website)
According to adwords tool "mobile recharge" searches in India are much more than, for example, USA and UK.
mobile recharge business in India right now is very tight. Profit in recharging is like max 2% in case of best operators so to be honest its not worthed it.