Section 16(2)(b) in The Direct to Home Broadcasting Services (Standards of Quality of Service and Redressal of Grievances) Regulations, 2007
(b)display, at its each office, Call Centre, customer care center, help desk, and, at the sales outlets, website and at the office of the Nodal Officer, the name of the Nodal Officers, addresses and telephone numbers, e-mail addresses, facsimile numbers and other means of contacting them.