As a former employee of USCIS I can tell you that there's an internal policy where they may take up to four months to give you a response. You can always check the status online, by telephone, or with an infopass. If none of that resolves the problem after several months you can submit a processing request through your local congressional office and as a last resort you can file a Writ of Mandamus with the Federal Court. If nothing happens for more than four months I suggest contacting an...
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Re-entry after deportation is a crime for which he can be charged criminally under Federal statute 8 USC 1326. If convicted he can be sentenced to two years in prison. The sentence can be more severe if he was deported due to certain criminal offenses.
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In addition to filing an AR-11 you should also call 1-800-375-5283 and change your address with them as well as that will process faster. It is not a substitute for the form but helps with expediting an update of their system.
If an interview was set and you did not appear the case will be denied as a "no-show"/abandonment. If you entered the U.S. lawfully you may still be able to adjust status if your husband is still willing to petition for you and the bona fides of the marriage exist.
If you were charged you have remedies in your criminal case. If not you may want to consider a potential lawsuit. Of course when preparing such a suit it may be difficult to calculate damages.
I am not an attorney in Maryland, but there are most likely certain post-conviciton and/or equitable motions available to you to file in State Court to remedy this error.