Thanks, everyone for your help...
I went to immigration today and no worries... They cancelled my work permit, gave me 2 weeks, and then I have to go back on the 31st and get 2 months.....
TLDR : Answer Summary
The user successfully canceled their work permit and received a 2-week grace period, after which they will get a 2-month visa extension. Participants in the discussion clarified that, unlike the process in other countries, in Thailand, both the work permit and visa must be canceled simultaneously when changing employers. It was also noted that a letter from the employer confirming the end of the employment is necessary.