Decisions are made at the top. Try to make contact at the highest levels and provide incentives for middle managers and assistants to help nudge your concerns or proposals upward. Business cards may be in English. However, promotional and sales materials should be printed in Hindi to reach wide markets. Phrase questions carefully.
Indian responses can be ambiguous to avoid upsetting a person.
Most Indian businessmen are Westernized, but many have fairly old-fashioned ideas regarding the status of women. Be deferential when dealing with bureaucrats. Before entering a home, ask if you should remove your shoes. Whistling is considered very impolite. One's feet or shoes should not touch another person.