Dear Mr. Thinfen,
I wanted to make you aware of the excellent service I received from your representative, De Non, on August 30th, 2011. I had a series of questions about a variety of topics affecting the performance of my Xerox Documate 3220, and De Non quickly and professionally answered all of them. I found his insight and suggestions to be very helpful, and I appreciated his kind, patient manner. De Non is a wonderful example of what ‘tech support’ and ‘customer service’ ought to be.
I hope that you will use this letter to acknowledge De Non’s good work. He is an asset to your team, and he has given me a very good impression of your company.