Amazon India — amazfit smartwatch not delivered but marked as delivered

My product has not been delivered to add bt same was marked as delivered on 10th oct. I enquired wth courier, he confirmed tht product is wth him & will b delivered later tht day bt same was not done so i calld again next day bt he was not picking up my phone. So i calld cc, who askd me 2 wait until 12th so i waited bt still it was not delivered so i called cc again and they have rasied an investigation and askd me 2 wait for 5 days so after waiting for 5 days the told they cant help anymore as per their investigation product is delivered but its not delivered to the given address. Also when i enquired to whom it was handed over, they gave me name of a person who was not even in the city, so how come that person took delivery? They have started reinvestigation and asked me to wait for another 3 days but i am not very sure about what extra they will do this time so raising a complaint here.