Dear Khun Niramon,
I must complain. We have been the last 2 days to the immigration office to extend my visa. Due to discrepancies of the dates of cancellation given in the work permit (no date) and the visa (29.07.2015) and the fact that I was working with my new employer since July, I cannot extend my visa. As a professional attorney L&P should be aware of those discrepancies and should inform about the proper way of processing in advance.