Which version of Osclass were you using? latest 3.7.3Which themes / plugins and which version of each one?veronica, still now they will not reply me,yesterday i wrote review about veronica
Which version of PHP / MySQL ? 7/
Did you have any other software installed in the same server (Wordpress, joomla,...)? even if it's an old installation no longer in use.yes wordpress
Did you use strong password for your services? (FTP, SSH , MySQL,....):yes, num,caps letter,small letter ,and special character
Restore the last backup, update your software, and look for any potential security issues. i dont have backup, from last 21 days developing i'm from india so here network is verry slow that is why it take long time.
i don't know what i want to do next

i asked support for my hostgator they told that remove all files and ask your designer before deleting , after that asked support for my theme designer still now they did not reply me (reached 12 hours)