sure it wasn't a competitor hacking your pw?
Do you think Amazon is going to tell us who hacked them? That would be like Trump telling us that Russia helped him get elected.
A competitor with legitimate-seeming access to our seller account would not have to "hack" as was done. They could simply change some payment settings and be done.
Curiously, Amazon actually let most listings stay - with photos, pricing etc. - but deleted all our descriptions, keywords and all the silly fields they make you fill in. As if THAT would have any detrimental effect on the hacker...