What should I do if my current company will cancel my work permit after my new company processes my new visa?

Hello I need some advice,

I will end my work at current company in 30 April.

And I need 7 days after the cancellation the current work permit, because I will make a new WP and visa for new company within 7 days.

My current company said will process WP cancelation in 12 May,

But my new company will process the new WP in 2 May and expected the current company will cancel it in 30 April. Meanwhile one of requirements is must cancel the current visa first.

My questions:

1. can I get and apply additional days after 7 May?

2. Does the paperwork of wp cancellation needed when apply new WP?

3. I asked Labour Staff, they said that I must come with Local staff when WP cancelation. What actually they will do or ask to the Local staffs?

Thank you in advance for your answer, I really stuck about this 😞