maitainance to wife

sir i am giving 5000 rs to my wife as maintainance per month.but she has again file a case of maintainance to increace more rupees in that.but sir hv full responcibilities to maintain my 2 children and spending much for thier education.my entire family is depended on me.and i also come to know that she is having adultery with someone and she also does a job of nurse in hospital .somy querry is :if court again order to give her more than 5000 then can i go againat that case to file it in high court???i hv all proofs of my childrens expences.will high court give some relief or oerder the same??till then will i hv to give that 5000 continuosly to her??plz guide.or i hv to simply obeycourt order??