Amazon — Cash Back not yet received after one month of proposed date

Address:

West Tripura, Tripura

I bought Casio Inc. CTK2400 61-Key Personal Keyboard with Built-In Microphone on 8th May 2015. My order id is[protected]. It was the biggest summer sale on Amazon. I was eligible for a cash back of 15% on purchase of articles above Rs. 5000 through SBI debit card. The last date of cash back was 8th August which was supposed to be credited in the bank account. However, till today i have not yet received the cash back. I have contacted the customer service of Amazon many times and they are just delaying the matter saying the cash back will be processed soon. Its nearly a month getting over. Still no action has been initiated by Amazon. I am very much disappointed. The customer service is disgusting. I want all other customers to be very careful while purchasing anything from Amazon.