Dear Mrs Warisara,
after you worked on Friday, you announced that you will not continue to work on Monday. This behavior is a breach of the working contract. You didn't talked to me directly, just write a Skype message. This is not acceptable. Usually that would mean a contractual penalty.
I suggest an extrajudicial settlement in this case: AMDIS will pay 6000 Baht for the last month and we terminate the contract so you leave by mutual agreement.
Let me know, if you agree on that. You can call Khun Sudarat if you have any questions