National Highways Authority Of India [NHAI] — Extra deduction of money from fastag

Address:

HR29AV3213

There is an extra deduction of money on mahovan toll plaza, up.
How is it possible to deduct the money two times in same direction within 17 min.
The amount deduction was supposed to be 55 because it was returning journey. My car was entered in the toolplazza at 11:59:31 and 55 was deducted but the door was not opened and when after waiting 15 min i changed the lane at same toolpazza 105 rupees more deducted