proofread : correct/polish the same paragraph

============ Writing email to my previous company-ABC HR, Requesting her for employment refernce letters for my PR process  =======

It has been long time since I left the organisation. I must say experience with ABC had been wonderful, and its transparent HR process.
Still I miss the annual gatherring parties.Hope such parties still ABC keeping alive.

regarding reference letters I requested for my PR...
you might have provided such reference letters so far, for many PR aspirants. I didn't exactly get the reason for the delay getting requested letter.
If the reason for my employment,  my experience letters sent you in earlier communication, hope that will give you enough details.
More details you can get from your internal employee database.

About my job roles,as a IT Consultant,the document sent you mentioned most generic roles not to make it complicated.

I am waiting for your letters to procede next level of processing for my PR processing.

I am sure, you will help me getting the required documents in this regard, also wishes me to succeed.

I really appreciate your help
XXX