If the woman is divorced and remarries a man, then that does not amount to bigamy. However during the second marriage if she keeps a relationship with her first husband then it is an offence you can make criminal complaint against her first husband by invoking the penal section 497 and 499 of Indian Penal Code before the appropriate criminal court in India.
Further, in India, there is no provision under law which can punish a women for adulterous relationship.
Furthermore. you can file a divorce under under Section 13 (1) (i) and Section 13 (1) (ia) on the grounds of adultery and cruelty ,and seek dissolution of marriage. It is pertinent to mention here, that to prove adultery is generally very difficult, the onus of proof is usually on the petitioner and you need to have strong and cogent evidence to prove that she has committed adultery.
Also, with respect to maintenance if you can prove cruelty and adultery, there are various judgement of Supreme Court and High Court wherein the court has denied maintenance to a Wife.