The INS cannot read your mind, so let them know your new address or be prepared to face the consequences. Your application is approved, but was forwarded to the National Visa Center, so that it can assign an immigrant visa number. It can take from 6 weeks to 20 years to issue a visa number depending upon the visa category. You are the victim of fraud . Attorneys are regulated by every state in the U.S., so there is a government agency to complain to, where you believe you were the victim of an attorney.
Applicants are without the same recourse where an unauthorized non-attorney prepared the material.
Report non-attorney's to the INS and the police, where you think that you are a fraud victim. Hopefully, these officers will investigate the matter. Unfortunately, you are also responsible for any misrepresentations made on your application, even when someone else prepared the application. They can claim that you lied to them. The one last unlikely exception is INS worker fraud.