National Highways Authority Of India [NHAI] — Money deduction differ

Address:

adarsh nagar street no6 #d2692

Hello sir/mam
I am from Fazilka punjab yesterday I gone to ambala money deductions differ @HDFC Bank FastTag deducted: Rs 75 for Vehicle No: DL8WC38899 at: Ghagghar Toll Plaza on:[protected]T10:05:29 Wallet: [protected] Bal: Rs 550
HDFC Bank FastTag deducted: Rs 40 for Vehicle No: DL8WC38899 at: Ghagghar Toll Plaza on:[protected]T13:37:02 Wallet: [protected] Bal: Rs 510
What kind of service is this same toll centre but money deduction is differ while going to ambala @75rs. Deduct on return @40 rs. Deduct