Amazon India — product not delivered since 15 days

Website:

Amazon

Dear sir,
On 03.06.2018 i ordered 4 products from your app. 3 were delivered and 1 was supposed to be delivered by 08.06.2018 but it is not delivered till date (18.06.2018). When i am trying to talk to your customer call executives they are not calling me back. Moreover they have blocked my number from calling. Two days ago i requested to cancel the order but it was not done and link to cancel my order has now been removed.
What the hell is this???
You are totureing a loyal customer for ordering products from your app.
What kind of services you offer when you cant even talk to your customer regarding the order for which he gas paid you full amount.??
Horrible services!!! Please cancel my order and refund my money back asap.

Kanika