After you cancel your account with Woztell, these are the reuse options for the number that is registered as WhatsApp Business API.
Re-use as personal or business WhatsApp
When unsubscribing with a Business Solution Provider (BSP) such as Woztell, the provider will delete the number information from the WhatsApp system.
After 2 months it will be possible to ask WhatsApp to reactivate your personal or business WhatsApp account.
Using the WhatsApp Business API with another provider
It is not possible to use the same number with different providers, because WhatsApp does not allow number portability between BSPs.
It is possible to reactivate the number with Woztell after the account has been canceled. To find out how you can read this article.