Teach middle management on how to treat everyone equally, respectfully. Select people who have excellent knowledge and ability on taxation laws, so can save time and money on training in knowledgable new people. Save trained staff members no matter they are permanent or casual improve their insight instead of sending home and train more new people and giving away inside integrity day by day.
Nothing...it was a personal decision.
They have to take into account or have a sound knowledge about other race and culture. So that they can understand the basic mentality of the multi culture people working with them.
They should leave instead