Hi Mr. Sujoy Banerjee,
This is in regards to your query posted on the website CarDekho.com, we would like to inform you that the ground clearance of Honda City is 160 mm where as the ground clearance of Honda Civic is 170 mm. You can send us your contact details along with your query on firstname.lastname@example.org and one our auto experts will arrange for the free test drive and you can check the difference.
Honda recently discontinued the Civic in India, however you can buy a used Civic. You can visit our, used car section, where you can find good deals- http://www.cardekho.com/used-honda-civic+cars
Well, it is quite early to reach on any conclusion, whether the service network you visited provided you the correct information or not. We would suggest you to search for another service station, if it also gives you the similar advice then it would be better to repair your car. Their could be multiple reasons behind the noise coming out from your car's engine such as badly aligned camshift belt, faulty front brakes pad, and not so proper felt belt.