If what you say is true and your family consists of you and your wife then they are wrong. Hire a lawyer to fight them over this.
It looks like the government is mistaken. You or your attorney need to supply your joint income tax return and explain that your joint income exceed 125% of the poverty level.
Please click the link at the very bottom for additional information.
Carl Shusterman, Esq.
Former INS Trial Attorney (1976-82)
Board Certified Immigration Attorney (1986 - Present)
Schedule a Legal Consultation - Telephonic, Skype or In-Person
600 Wilshire Blvd., Suite 1550
Los Angeles, CA 90017
(213) 394-4554 x0
Web: www.shusterman.com (English)
(213) 394-4554 x0 Mr. Shusterman is a former INS Trial Attorney (1976-82) with over 35 years of immigration experience. His response to your question is general in nature, as not all the facts are known to him. You should retain an attorney experienced in immigration law to review all the facts in your case in order to receive advice specific to your case. Mr. Shusterman's statement above does not create an attorney/client relationship.
From the information you have provided you meet the requirements.
Robert Brown LLC
2530 Meridian Parkway, Suite 3050
Durham, NC 27713