Hi. I may not be the freelancer you want for this job, in fact i'm not familiar with modx but I was looking at your website and was wondering if it has any security because it sounds like your website's been hacked. Presumably your hosting company should be required to clean this infected website but even if it gets cleaned, without more security you'll probably get hacked again.
Have you considered rebuilding this website using a more secure cms (content managing system)? Wordpress, for example is really good about security, it's also flexible and easy to use. I'd be happy to give you more information about this. I'm very experienced with wordpress websites and would be willing to rebuild this website for you. Feel free to ask me any questions if you have any.
thanks.