What can I do to fight against a total injustice done to me by my local rabbinical court which awarded child maintenance against me without me even being invited to the hearing,or being able to file a defence?

Firstly, you can appeal against the ruling to the Greater Rabbinical Court,and if you lose, or win,but the practical outcome is akin to losing,you can consider filing a petition against both courts, to the Supreme Court of Justice. Under exceptional circumstances, Israeli law allows petitions to be brought against religious courts and for the Supreme Court of Justice to intervene in their decision making process, if they acted outside their authority /the constitutional right to a fair legal process were railroaded and there was grave injustice. It can cancel judgments and decisions, usually where the wronged individual has exhausted the legal process,including all possible appeals.

In January 2010 our legal practice filed a petition against Beersheva Rabbinical Court and the Greater Rabbinical Court concerning six child maintenance judgments made against a father,a Yeshiva student, without him being invited /having the opportunity to attend any hearing,or even to file a defence, in total contradiction of rabbinical court procedures,and principles of a fair hearing. While the Greater Rabbinical Court accepted the father’s appeal in principle, it failed to return the case to the district court to rehear the matter,so the victory was “hollow” leaving the father to face the practical injustice of the farcical and illegal process.