WhatsApp allowing Developers or friends to hack

I would like to know how is it WhatsApp gives access to developers to manipulate their right, to assist users or themselves the right to access other peoples WhatsAppaccounts my number is +*** and was duplicated without consent also to the point where i could not access my own WhatsApp. So there's no security with access via twitter etc and *********s or ******ers would be able to do as they please to the victims they choose. I have locked my number since and would like you to let me know why is this possible? i can send you a csv file of all my WhatsApp conversations duplicated on my ex wife's blackberry +*** if she is a developer or who has assisted her. I reside in south Africa and trust a thorough investigation will be conducted and I have the proof needed so there is no way you WhatsApp can brush this off or I feel you should be closed off as a social service as peoples privacy is not secure?