As per Emirates the fare restrictions are on my DXB - COK sector and DEL - DXB sector. They are not only asking $500 for upgrade also asking $400 for ticket re-issue. You are correct, it is better to find my own hotel.
My travel starts from YYZ and we are taking a holiday in Dubai before my trip to Japan. This was the orginal plan and with this development, we are thinking of other airlines and other destinations for our Holiday.