Why shouldnt I be sure that you yourself have closed your site and decided to make it seem like you hacked it?
I met such cases, then scam could not make money on his site and decided to hack his own site.
but if you really did it - well done.
More likely a partnership gone wrong. Others run with the money while the partner is left with nothing.
@OP there are many hyip website now please hack all of them and deface their website to serve a good lesson to their scam behavior.