“To Whom it May Concern:
I would like to praise Mary your representative at your Griffenpest Solutions Call Center.
Being a Senior and living on a fixed income etc.  Being a loyal customer for almost or over 20 years  I had a problem.  Mary listened to me, very patiently, and said that she would be happy to take my concerns to her manager and get back to me.  SHE DID, AS SHE SAID SHE WOULD.  Mary did get back to me with a solution that I agree with.
I appreciate you hiring very compassionate individuals and training them well.
Thank you”