(unless you would like to remain anonymous)
We'll try to call first, and if we can't reach you, we'll email you.
If we can't reach you by phone, we'll use email.
Let us know whether you'd like to rip off our head, or just give us a stern look.
The more information you can give us, the better we can solve your problem and fix the cause.
Tell us how you expected things should have turned out
What would you like us to do to rectify the situation?