Amazon India — Delivery of fake phone and bad delivery

Address:	Mumbai City, Maharashtra, 400090
Website:	www.amazon.in

Dear all,

I had purchased xiaomi redmi note 3 (gold, 32gb) order #[protected].

1) phone got delivered after a followup of 4 continuous days after the expected delivery date with the amazon customer care
2) now the phone hangs alot and doesnt works properly. i called the customer care and asked for a replacement. customer care says it considered my request under a special case as if they are doing a favour to me. hell yes, you are a shopkeeper, its your responsibility.
And they will take away my phone and deliver the new phone in 3-5 days.

Now how can i keep my number on for those 5 days? i guess amazon should also answer this. also, what is the gaurantee that this time also the phone will be delivered on time?