Problem with Theme script

After we had a MalWare attack, our hosting vendor managed to get us up and running, but there is still a problem – logo on theme header not loading.

Hosting vendor says: I could see that your website theme is cauisng an issue because of that its not showing logo, i have chekced with wordpress version, plugins and all but there is an issue with website theme, theme issue shouldbe fixed from theme vendor end so can you please contact your theme vensor and ask them to fix your theme issue , once you contact them they will fix it and confirm you. Its issue with theme script , and come updates, you can tell them so they can check from their end

Sooo, please help…

f