There is a law enacted in Madhya Pradesh since mid 1960s when Congress was in power, to protect peoples religion, specially that of poor.
Even Supreme Court has upheld that in a ruling in 1979.
That law must be applied and all those missionaries, their leaders, fund suppliers must be brought to justice. It needs to be find out whether they followed thr rule of law, applied for conversion before magistrate well in advance.
Unless missionaries are stopped, it will create huge backlash from Hindus.