Lost my account and NO HELP from WHATSAPP!

I am very dissatisfied with Whatsapp. I have been useing whatsapp for more than 10 years. I have 2 business and communicate with my clients and friends thru whatsapp. Sunday with no warning at all my account has been banned? And 2 weeks before my facebook and instagram account has been deregistered. Cleary my account has been hacked. Now they wount even allow me to log back into my account to change my password and login detail so that I can use my accounts again. I am an Advocate so I clearly now about terms and condition policies and will not do anything that is not in line with the policies. How can they now just leave this matter unresolved without even looking into the matter and getting the facts?