From the brief facts it is difficult to say that work place discrimination exists.
If it does then of course all form of evidence would come in handy e.g. email, telephone conversation etc.
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Circumnavigator, lawyer and columnist and the man who divides his time between Singapore, Hong Kong and China. I believes that etiquette transcends nationality and race. 
In this column I will offer stylish advice to everyday questions on etiquette at work and at home and anything else that may be bothering you.
