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SO, THE MAIN QUESTION HERE,

If let say MAXIS sells my number to new customer, will they be able to see my Whatsapp message ? Would they be in the groups i been?

Isn't this sort of security breach/issue?

So, any advise on what can i do ?

Any way to retrieve whatsapp only OR , AT LEAST, delete/deactivate the account? - i don't have the number with me now.(deactivated dy).

I'm a prepaid user that got terminated by them.

So, you are saying, the new user will be able to send message to contacts or groups, right?

Isn't that a security issue(people be able to act like me and get some data?)?   

What can i do ?
*They never ask about my Whatsapp termination. They just terminate my number straightaway.