| S.No. | Organization | Contact Number |
|---|---|---|
| 1 | D-Link (India) Limited | 1800-233-0000 |
| 2 | D-Link (India) Limited | 1860-233-3999 |
| 3 | D. M. Systems Private Limited (DMS) | 1800-313-1312 |
| 4 | Dabur India Limited | 1800-103-1644 |
| 5 | Dahua Technology India Private Limited | 1800-103-5719 |
| 6 | Daikin Airconditioning India Private Limited | 1860-180-3900 |
| 7 | Daikin Solution Plaza | 1800-102-9300, 1800-229-300 |
| 8 | Dakshin Gujarat Vij Company Limited (DGVCL) | 1800-233-3003, 19123 |
| 9 | Dakshin Haryana Bijli Vitran Nigam (DHBVN) | 1800-180-4334 |
| 10 | Darshan Foods | 1800-102-0491 |
| 11 | Dasmesh Mechanical Works Private Limited | 1800-532-6726 |
| 12 | Dax Networks Limited | 1800-4255-329 |
| 13 | Ddecor Home Fabrics Private Limited | 1800-267-9008, 1800-103-9008 |
| 14 | Delhi Development Authority (DDA) | 1800-110-332 |
| 15 | Delhi Transport Corporation (DTC) | 1800-118-181 |
| 16 | Dell International Services India Private Limited | 1800-425-4026 |
| 17 | Den Networks Limited | 1800-419-2020 |
| 18 | Department of Collegiate and Technical Education (DCE) | 1800-425-6178 |
| 19 | Department of Commercial Taxes (DCT), Chhattisgarh | 1800-233-5382 |
| 20 | Department of Commercial Taxes, Madhya Pradesh | 1800-233-0440 |
| 21 | Department of Commercial Taxes, Uttar Pradesh | 1800-180-5223 |
| 22 | Department of Consumer Affairs | 1800-11-4000, 14404 |
| 23 | Department of Excise and Taxation | 1800-180-8087 |
| 24 | Department of Food & Supplies and Consumer Affairs & Legal Metrology | 1800-180-2068 |
| 25 | Department of Forests & Wildlife Preservation | 1800-180-2323 |
| 26 | Department of Higher Education Commissioner, Haryana | 1800-180-2038 |
| 27 | Department of Irrigation and Flood Control | 1800-118-595 |
| 28 | Department of Local Government (DLG), Punjab | 1800-180-00172 |
| 29 | Department of Pharmaceuticals | 1800-180-8080 |
| 30 | Department of Power, GNCTD | 1800-112-222 |
| 31 | Department of Taxes, Manipur | 1800-345-3811 |
| 32 | Department of Tourism | 1800-208-1414 |
| 33 | Deputy Medical Commissioner | 1800-180-2027 |
| 34 | Dewan Housing Finance Corporation Limited (DHFL) | 1800-223-435 |
| 35 | Dhanlaxmi Bank Limited | 1800-425-1747 |
| 36 | Dharamshila Narayana Superspeciality Hospital | 1800-309-0309 |
| 37 | Dharamshila Narayana Superspeciality Hospital (DNSH) | 1800-030-90309, 1860-208-0208 |
| 38 | DHL Express (India) Private Limited | 1800-111-345, 1800-200-1345 |
| 39 | DHL Service Point | 1800-111-345 |
| 40 | Digisol Systems Limited | 1800-209-3444 |
| 41 | Director General of Income Tax (Vigilance) & Chief Vigilance Officer | 1800-180-1961 |
| 42 | Director of Income Tax (Vigilance) | 1800-180-1961 |
| 43 | Directorate for Welfare of the Differently Abled | 1800-425-0111 |
| 44 | Directorate General of Foreign Trade (DGFT) | 1800-111-550 |
| 45 | Directorate of Agriculture & Farmers Welfare, Haryana | 1800-180-2117 |
| 46 | Directorate of Agriculture & Food Production, Odisha | 1800-345-6769 |
| 47 | Directorate of Industries (DIC) | 1800-270-1213 |
| 48 | Directorate of Social Justice & Empowerment and Minorities | 1800-112-001 |
| 49 | Directorate of Welfare of Scheduled Castes, Backward Classes & Minority Communities, Punjab | 1800-137-0015 |
| 50 | Dixcy Textiles Private Limited | 1800-102-5066 |
| 51 | DLF Limited | 1800-103-3534 |
| 52 | DNP Limited | 1800-345-3433 |
| 53 | Domino's Pizza | 1800-111-123 |
| 54 | Dr. A.P.J. Abdul Kalam Technical University | 1800-180-0161 |
| 55 | Dr. Babasaheb Ambedkar Open University (BAOU) | 1800-833-1020 |
| 56 | Dr. Babasaheb Ambedkar Research and Training Institute (BARTI) | 1800-233-0444 |
| 57 | Drish Shoes Limited | 1800-137-0107 |
| 58 | DSK Benelli | 1800-266-2324 |
| 59 | Dyson Technology India Private Limited | 1800-258-6688 |
Customer Care, Customer Care Numbers, Customer Service, Customer Support, Helpline Numbers, Product Support, Telephone numbers, Toll Free Number, Technical Support, Technical Customer Care, HelpDesk, HelpLine, Customer Support, Support Helpline, Support Desk