Amazon India — Fraud doing by amazon

Order no[protected]
i have ordered kemei 3580 trimmer and they deliverer me a used kemei -3560 product, i received it on 12 sep 2016, complained immediately for return and called on their customer care till today minimum 60 times, but no courier coming to pick up my product,
on 14 sep 2016 one customer service executive told me that because you calling again and again and no one coming to pick up your product, as an one time exception we providing you advance refund and we initiated it, when any courier comes you just deliver the product to him, then i received mail by them, but after that till today i not received my refund on account, i called customer service of amazon they changing their statement, but i managed to get 2 more mails with same information, but no refund till today, i dont know what is going on their, i first time seeing this type of delay in refund, they told me 2-4 days wait today 4 working days completed and no refund