[Date]
[Name],
Company and Address
Dear Mr. / Ms. ——- [Name],
I regret that we have had a less than satisfactory experience with ———— [Name], whom you sent to us as a temporary [Position, exp. secretary] on ————–[Date]. [State nature of dissatisfaction, exp. Her curt nature of dealing with customers on the phone resulted in three separate complaints made to me by displeased callers.] {Unfortunately, I was forced to let her go [TIME, ex. after the first day}.
Since I know your firm to have reputation of providing decent services, I am confident my experience is merely an uncommon aberration. Nonetheless, I trust this information to be useful to you.
Sincerely,
[Name & Signature]
