Dear …
RE: Reference/Case __(Name/Number)__
I am writing to you as a follow up to __(your letter dated/a conversation I had with you/name from your office on)__ __(date)__, wherein __(you/he/she)__ indicated to me that __(briefly describe what they said they’d do)__. I have been patiently waiting for __(length of time)__ now for this __(briefly describe what you’ve been waiting for)__. Unfortunately, as of this date I have still not received any __(additional information/further news/etc.)__. It is __(important/imperative/so vitally important)__ that __(I receive this documentation/that this situation is quickly brought to a close/etc.)__ because I __(briefly describe why)__.
I ask you to kindly look into this matter for me and provide me with __(a status updateof /the final documentation on/etc.)__ __(the situation/my `type` case/etc.)__. Thank you for understanding my situation and responding to me in a timely manner. I look forward to hearing from you soon.
Yours truly,