Did you look at your hosting files to see if maybe they attacked your files - first guess would be your .htaccess file, and are forwarding to themselves?
Or did they hack your domain account and have change the DNS?
When you look at the info in your domain account - are you still the owner?
A company called "domain sponsor" has taken over my website address. If one types the name of the domain for which I paid in the browser, the browser goes to their site. The registrar, Melbourne IT, says that it cannot do anything while the host Microsoft says that the registrar has to intervene.

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