Kotak Mahindra Bank — not getting me my cash back 2000 rs return after complete 3 emi

Address:

room no 02 behind fish maket near dadoji konddew stedium,mahagiri thane west, Thane, Maharashtra, 400601

Sir i have purchased lenovo laptop from reliance digital thane (Maharashtra) on whole finance by kotak mahindra bank.. I have paid processing fees 1300rs for it. Kotak rep said 2000rs cash back will get after 3 clear emi paid... Now its complete... But now nobudy is responding so plz give our 2000 cash back as per bank rule thank you!!
My consumer loan account number is-1184701 plz take action as early