Dear

On     [date]    , I attached my letter to the merchandise
I returned to you and requested a refund for same.  I have
enclosed a copy of that letter for your convenience.

As you will note, quite some time has elapsed since I
initiated my first correspondence, and I have not yet
received your check.  I would appreciate it if you would
tend to this matter as quickly as possible, since I am
sure that you can understand my reluctance to order any
additional merchandise from you under the present
circumstances.

Thank you for your prompt attention to this matter.