Should you really wish to…

I really can’t say it better than the inimitable Cabin Pressure, so if you have a complaint,

Tell you what: why don’t you write it down, put it in an envelope, tear it in half, throw it away

If that doesn’t deter you, then unsolicited mail may be considered on absolute condition that a proper subject-heading be used and full grammatical sentences employed to convey your message. This isn’t a forum you know.