As Mr. C said, that is absolutely an action of last resort. Before taking it, I would advise a thorough self-examination with a hyper-critical eye and ask the following question: "Did I absolutely provide the MSC with everything the client ordered in the shop?" And be very critical and objective in answering that question. If you decide to pursue contacting the client, be aware that by doing so, you may possibly burn more than just the bridge with that one MSC...there are many schedulers and other MSC employees on this board.
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Have PV-500 & willing to travel.
"Answers are easy. It's asking the right questions which is hard." (The Fourth Doctor, The Face of Evil, 1977)
"Somedays you're the pigeon, somedays you're the statue.” J. Andrew Taylor
"I have never met a man so ignorant that I couldn't learn something from him." Galileo Galilei