In Union of India v. Sistema Shyam Teleservices (2026), the Supreme Court held that the DoT, having “slept over the matter,” cannot levy interest retrospectively on telecom operators for a period of its own delay and interest runs only from expiry of the show-cause notice period. This critical ruling on ISP license fee disputes, DoT demand notices, and Telecom regulatory compliance affects all Internet service providers in India. Whether you are an organisation or individual facing TDSAT litigation, spectrum dues, or IT Act intermediary liability issues. consult the Best Lawyer in Delhi for top telecom legal advice today.