Mahindra And Mahindra — complaint about fastag sold me as compulsory service by advisor

Address:

Nagpur, Maharashtra, 440033

Hi,
I am vinod pachpor from nagpur purchased a car from unnati motors kamti road nagpur, on 3rd of april but advisor told me that it is compulsory to purchased fasttag of rupees ind rs 4600 but it is not working after i used it ones in octra for rs 40 but after that it is shown as invalid means their is no money in fadt tag so why they took 4600 as compulsory which is not required in nagpur place where no special lane for fast tag cars. So please reward me my money thank u.