If you suspect your site has been hacked then seek for professional help! And do it fast, having a hacked site in your hosting account is a violation of our Terms of Service Agreement, and you risk your account to be suspended.
Don't panic and make things worse by restoring from a backup, blindly stabbing in the dark or making uneducated guesses if you aren't qualified to fix a hacked site.
We have in our offering the packages you might need - but aquiring one of them is just one of your options. You can hire anyone else, just be sure, that they are qualified for the job!