If you've received a divorce notice from your husband who has remarried via a 'Maitri Karar', you should respond through a local lawyer. A 'Maitri Karar' is a friendship contract, often used in Gujarat, that allows a married individual to form a union with another person, sometimes circumventing marriage laws. While not strictly legally enforceable, it's advisable to consult a senior advocate to understand your options and contest the divorce, potentially filing for maintenance.