National Highways Authority Of India [NHAI] — fastag lane used by all vehicles

Dear sir,
My name is amit. And i want to ask a question regarding hastag. Is daerah lane used by all vehicles?
Because when i was passed through tall plaza at ahmedabad expressway at ring road side there is only mention hastag lane but all vehicles passed through hastag lane. Also there is one board on which wrote that if non fastag vehicles passed through fastag lane then they will charge double. But this rule is not follow. If any query you can call me on my mobile no. [protected].

Also the person not answer proper regarding hastag.

I think is there any mistake by me to purchase fastag???

Regards,
Amit