Relieving letter is not proper or untrue

A company based at Pune executed separation from employee, i.e. co was sending out me due to closure of project in which I was working.I got a separation mail also from HR person quoting the same. But When they give relieving letter they/HR had given that "He has resigned from our organization for Due to Project Closure . His resignation was accepted and was relieved from his duties effective from-------". WherasI want to be straight forwarded tuthfull to,do not want to have suspicious questions from my future co. So I requested HR to give as "Our co i.e. xxxxx Pvt Ltd could not get business, because of the business-discontinuity we close the project inwhich he was working, thereby, not as a fault of the member we separated him from employee." I did not get any response for 2 weeks for my above request, what I shall do to get it done. I am at and worked at Chennai-Co's Customer site.