I see. Thank you for the additional information, Phelix.
I would request a policy manual and review it. Unless there is a policy requiring notice or you have an employment contract, an employer can normally change the terms of your employment at any time since you would be considered an employee at-will.
This typically permits an employer to modify the terms of employment at will or in other words, at any time, and either the employer or employee may terminate the relationship altogether at any time without notice or good cause.
The employer's policies can modify the at-will relationship though, so it is important to request an employee handbook or policy manual to determine for certain whether there was a legal obligation to notify you in advance.
If the employer violated its own policies, you could pursue a claim against them for breach of implied contract if you suffer damages as a result of their violation.
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