My opinion on your queries are as under:
1) Do I need to hire some big lawyer in such a case which is obviously false?
Opinion: Its depend on you that you are comfort with the big lawyer or not, as per my opinion you have to contact a lawyer in district court and fight the case on merit.
2) Can the court simply go through the documents and dismiss the case without a need for a lawyer just hearing the case from the accused and the victims?
Opinion: Its depend on the case, it is complaint case or State case? what is the stage of the case?
3) I talked to a lawyer and she is asking for Ninety Thousand for the entire case, which to me seems pretty straight forward! Is this amount fair?
Opinion: Its depend on your capacity, the fees may be 50,000/- and fee may be 5 lac, if you are satisfied with her fee then it is ok otherwise contact some other.
4) What can be counter measure in such a case where ladies are involved (hawker , her daughter, her daughter in law) from this turning later on as they can file any kinds of cases?
Opinion: try to settle the matter amicably with them with the help of the lawyer, mediator and other society members, it will be better.
5) If this is proved a false case what measure can be taken to punish them for putting in false cases?
Opinion: You may file a criminal defamation case against them u/s 499/500 of IPC.
you may file a criminal complaint u/s 182 of IPC against them before court for malicious prosecution.
you may also file a civil defamation against them before civil court and claim compensation as per your status.
you may contact personally or over the phone after pay the consultation which is very nominal