National Highways Authority Of India [NHAI] — commercial fast tag sold on private vehicle

Hi i have purchased a fast tag from nhai moradabad bareilly expressway. On 23-02-20 around 11:20 am. My vehicle reg no - dl9cak4974. When i was coming from delhi i paid 190 at toll plaza chhajarsi but after taking fastag they have taken 200 from tag. Also the person who has sold the tag to me he has no receipt. He has taken 250 for the tag. He told me that the tag is not free and from 250 amount 200 will be shown as security but after buying the tag i have to recharge worth 400 and from it 200 is showing as security, where is the 250 and what is the need of paying 250 for tag when it is free of cost?
Secondly i absorbed when i was travelling to bihar. Fast tag amount got deducted more than standard price. When i contact call center they told me that tag is for commercial vehicle hence amount is getting deducted as per the rule point is that my vehicle is private and tag sold me is for commercial. I have lost almost 1500 in extra due to mistake of nhai person. I have complaint regarding this earlier. Pls check the details and do the needful.