VJ has the info below on each and every page:
Important Disclaimer:..." VisaJourney.com recommends that if any member or user knows directly of someone involved in fraudulent or illegal activity, that they report such activity directly to the Department of Homeland Security, Immigration and Customs Enforcement. You can contact ICE via email at Immigration.Reply@dhs.gov or you can telephone ICE at 1-866-347-2423."
Unfortunately, even though you seem to be a victim of a very dishonest person, you'll still be tied to I-864 (for 10 years or until he naturalizes - earliest would be 5 years after entering on immigrant visa) even though your husband disappeared. You can try to get in touch with Islamabad embassy and USCIS but don't expect much.
Start getting your affairs in the order - divorce, take him off any medical, life, or car insurance if you had him listed as beneficiary. Same for bank accounts, retirement or 401k, savings... If you're renting, get his name removed as a tenant. If you co-signed anything for him, see how to get out of that financial obligation.