[discussion of specific problems]
With all due respect, there is a clear pattern of late, missing and incorrect information. Therefore, effective immediately, we are resigning as your pension service provider. You are an idiot and a jerk.*
[More discussion of suggestions - in this case, some of the problems were due to distribution and withholding problems b/c they were using a pooled account, and I suggested they go to a turn-key provider who would handle that stuff in their system.]
Our sincere best wishes to you and your business.
*Just kidding on this! But I thought it...
Add a PS: C'ya. Wouldn't want to be ya!