National Highways Authority Of India [NHAI] — about fastag

I travel through nhai dappar toll plaza. As now government has made it compulsory to get fastag installed on every car and government and even chairman of nhai group has claimed that they will provide fastag free of cost to everyone but when i visit the toll plaza to get the fastag installed in my car then they asked me to pay inr 450 but when i asked them that it should be free then they told me that if i want to get fastag installed then i have to pay this amount. So please look into the matter as they are charging money which they shouldn't.