We are not sure if the customer service is operational 24/7. So we recommend that you call during normal office hours.
For any help related to Gionee mobile phones, just pick up your phone and get in touch with their support team.
For any suggestions, complaints or queries you can write an email to the above mentioned email address. Gionee customer care will get back to you in 48 hours. In case they are flooded with queries, it might take them longer to respond.
https://www.facebook.com/gionee.india - Get latest updates of Gionee phones via their facebook page. You can also check what other people are commenting about their phones on the facebook page.