1800-266-121 is the toll free number using which you can get in touch with Tata Docomo customer care department. You can call on the toll free number for any queries, complaints or suggestions related to internet provided by Tata Docomo. For any issues related to an existing connection, please keep your 10 digit subscriber number handy. This will enable the Customer care agent to help you faster and create a service request if required.
Alternate number: Alternatively, you can also call on 1860-266-5555 if you have trouble using the above given number.
Tata Teleservices Limited, 2A, Old Ishwar Nagar, Okhla Industrial Area Phase 1, Delhi 110065
On the email support link, you can fill in the form on the website and the CS team will get back to you. Please mention you query in details as its sometimes hard to understand things over email.