Experience letter

Hi, I worked in css from sep-2012 to oct-2014. Due to personal issues I quit all of a sudden without prior notice. The company has terminated me for uninformed leave. After 2 years now I'm in search of a new job. Where ever I go they are asking for my experience letter and relieving letter. When I approached them they said they won't provide the experience letter. I sent a mail to the HR Team but there is no response. Is there any way that I can get the experience letter from them. Please help.