National Highways Authority Of India [NHAI] — Toll gates

We are travelling from Kanyakumari to chennai, , and we have paid for almost 5 tolls in 50 kms, , I don’t understand why we have paid road tax??, , this is reduculace, , for each 10 kms one toll???
And when we asked the people about this they are really shouting on us, , and they said go and complaint to the government in a very unrespectable manner. And upon to it they said the tolls are one we paid on NH44, in which we travelled for 5 kms, , and then NH7 they said and that too very short distance and then NH 38 and in this we paid 3 in 15 mins duration. please look into it and clear this mess.. really not happy to pay these many tolls after paying lakhs together of road tax. then why we pay road tax ?? And what all these??.