Hacked?

Sounds like you need to talk to Sucuri about their guarantee and your host about their service. Unless you’re willing to jump in and try and fix/secure the site yourself, you should deal with the people you’re dealing with now: Sucuri and the webhost.

Or, find another host: the WordPress team has provided a list of recommended hosting providers. For more details and other recommendations, please search through the forums or via Google (or your preferred search engine).

And then carefully follow FAQ My site was hacked « WordPress Codex. Then take a look at the recommended security measures in Hardening WordPress – WordPress Codex and Brute Force Attacks – WordPress Codex

If you can’t do the work yourself, consider looking for a reputable person on http://jobs.wordpress.net/ or http://directory.codepoet.com or http://upwork.com

(FYI, it’s not a good idea to respond to work offers from random forum users who have read about your issues.)