Amazon India — I had ordered Iphone 7 and I didn't receive that in the package.

Address:	New Delhi, Delhi, 110085
Website:	amazon.in

I ordered for i phone 7 on 15th of feb and when i got the package i got different thing in it and i called to amazon customer service and the ensured me that sir we will pick that thing and give your money back.
Everyday i called them and they say sir you have to give that item back and we are arranging the pickup for that and it has been 10 days they are arranging the pick up but no one called me for pick up that thing and nobody came to my place to pick up that thing and daily i got the text that your pickup has been cancelled.
I want my money back and i have all the proofs and recordings regarding this issue and they even ensured me many time that if it will not be picked up by tomorrow we will give your money back and now also they are saying the same thing.
I want my money asap.
Or i will do it officially.