Divorce case

My brother got married in april.. However after marriage we got to know that his serum count is less and because of this no physical relation could be made but within 2-3 months he will be fine after medication as per doctors. But his wife parents have threatened us and told us that he have lied to them and its a fraud which we have done to them. We were not aware of any such things. Marriage took place in arya samaj as the girl parents were from a low family. We have never asked for anything. We just wanted a nice girl for our family who is working so that they can manage there own expenses as my brother salary is also less. However after a month of marriage girl and his family have started putting allegations on us and left our house with all his clothes and jewellery. They have now filled a case in women cell. She is not looking for patch up. She just want us to pay them her overall expenses of marriage and even the jewellery and cash gifted by us.. They have not given anything to us still they have mentioned allot of wrong things. Please suggest what can be done as my family is unnecesarilly tortured by them. They are mentally harassing us by passing loose comments in public.