ICICI Bank — Regarding cash back offer of Rs 5000.

Address:	Purba Medinipur, West Bengal, 721636
Website:	www.icicibank.com

I am Chhotan Giri. I am purchased an Apple I phone from apple Store on 03/03/2017. And received a cash back offer with written in my payment slip that " you are entitled for a cash back of Rs.5000/- it will be posted in your account within 90 days."... But after 90 days I not get my cash back in my bank account. When i submit a service request in ICICI bank customar care after 3 days they ask me to send my payment receipt with offer details...Instant i send my details to customar.[protected]@icicibank.com.. But after 6 days my request was closed without any confirmation or email or any messages or any remarks.. When I cantact with customar care they told me that no offer found ...what can i do now???