Dear Customer (name blocked for privacy),
This why I suggest you contact the AG, FTC, and SSA Inspector General through the links I provided above. If you did not request the address change then these agencies can begin to investigate to find out who did and why, these complaints can begin the process of "finding out who." If you also follow the steps indicated by the FTC on their website, which include filing a police report, you can also begin to protect your identity and that of your wife's from further abuse.
PLEASE NOTE: Responses here are for information/education only, NOT legal advice and do not form attorney-client relationship! Only licensed attorneys you hire in your state can provide legal advice.