National Highways Authority Of India [NHAI] — fast tag - cheating customers

Address:

Bangalore, Karnataka, 560045

There are 2 tollgates between bangalore and tumkur in karnataka state. Passing through both the toll gates is rs 35. But fast tag is deducting rs 20 at each tollgates. This is cheating the customers using the fast tag. Please take appropriate actions.
Also these two tollgates ate very pathetically maintained. It needs 15 mins to cross each tolls even if you have fast tag. I dont understand the use of fast tags lanes in these toll gates.