Dear Felix
Your correspondence, dated [date], indicated that I would be receiving a refund for [briefly describe purpose of refund]. As of this date, I have not yet received a check.
Since I have moved, I am naturally concerned that the check may have been sent to the wrong address. Would you please let me know if a check has been mailed. If not, I would appreciate your authorizing one to be sent to the following address:
[full address, city, state, zip code]
Thank you for your attention to this matter.
By:Lydia