1. That you had left the organisation for some reasons but now you want to settle the dues (if any) towards the company and willing to receive the formal relieving letter.
2. If they do not intend to settle, it means either they do not have provisions relating to this or unable to settle it.
3. Just draft the suitable document with a statement that despite your willingness to settle the dues, if the request not entertained; it will be presumed to be relieved from the duties retrospectively i. e from your last working day. And this document will be treated as a relieving letter for all purposes. You can also send a copy of this to the concerning labour commissioner.
13th January 2013 From India , Jaipur