So in your case because the trip start date is on 15th July, so no need to produce the passport.You can get your policy cancelled only if you have not undertaken the journey and you produce your passport as a proof that the journey has not been undertaken.
You can go to the nearest office of the Royal Sundram.Do I need to submit the passport in their head office as I had bought the policy online?
P.S. Please call the customer care and ask them your query. For online policies, they take email requests also.