Amazon India — Not received the product nor money

Address:

411017

I had cancelled the order but still on next day got a message the item has been delivered even it was not delivered.
I had raised A-z guarantee with Amazon but they have not investigated it thoroughly and just saying item has delivered and we are not doing any further investigation.
So at the end I did not not received the item not the money.
This is not a question of the product cost Rs. 279 but its about the service a brand like Amazon is offering.