2. If there is a clear post, then this is job transfer, and job transfer can only be carried out with the consent of the transferred person. If the company does not negotiate with you, it is illegal, and you can not agree to the transfer.
3. If there is no clear post in the contract, the enterprise is generally playing the edge of the law. At this time, it is difficult to find the trouble of the enterprise, although the enterprise is wrong first.
If the nature of your job changes, don't quit. You can ask the company to dismiss you, so you can lose money, or you can negotiate with the company to leave and get compensation. I don't agree to transfer anyway.