Me too experienced this error of redirecting to airtel site after recharge.
I tried this and it worked.Hope it work for you too
- IN your mobile GO to Settings>>More settings>>Network settings>>Accesspoint names>>Select Airtel internet configuration
- Edit the Apn configuration as below
APN: airtelgprs.com
Proxy: (Leave blank)
Port: 8080
- Save the APN configurations
- Connect intenet
- Now it should work fine
- Note-it will only solve the error related to redirecting to airtel site.