Sorry to hear that. It’s not guarantee that it was caused by our theme.
It may cause by different security issues.
May those issue caused by outdated plugins and themes. We recommended you to update all the plugins and themes and install the fresh copy of the theme which you can get from your account by login into our site.
The issue has been resolved, thank you. It was a plugin which caused the issue after deleting it and removing the JS code from the page that has injected it in.