The management committee cannot debar any member of the association at its own will and wish.
Any such decision has to be passed by a resolution in the general or special meeting of the association.
It would be invalid and illegal to take such decisions unanimously by a select few of the management committee without following the rule or procedures aid down in this regard.
If you have received notice, it becomes your duty to give a reply denying their allegations and objecting their moves including refusal to accept their decision to debar.
After this the debarred members have rights to protest or file a case before the consumer forum or the cooperative court.
You can consult a local lawyer and proceed as per his further opinion and advise.