Thank you for the additional information.
No, an employee usually contains a disclaimer and is not treated as a written employment contract
At the onset, I can tell you, from the facts presented. You have done nothing wrong. You are not in a position to disobey upper management. You were literally placed into a no win situation, but there was nothing, in your position, that you could have done.
However, without a written employment contract you are deemed an at-will employee. As such, your employment may be terminated for any reason (or no reason), so long as it does not violate your civil rights (illegal discrimination
, for example). Therefore, even though you did noting illegal or improper, it is still possible for the employer to terminate you employment and not be illegal or improper.
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