ICICI Bank — not received experience letter even after 3 month

I am an ex employee of icici bank. My employee code was 321460. I resigned and completed my services at icici on 31st march 2017. Still now i havent received any experience or releiving letter from icici bank. Its been four months and i havent received anything from them. I am attaching my email follw ups with them. Its been very traumatising because i am unable to aplly else where because of this unavailabilty of experience letter.
Kindly help me out