National Highways Authority Of India [NHAI] — More charges being collected RFID fastag

I travelled twice from Chennai to Thirvannamalai via Cgenglepet total plaza on 19.3 and 2.4.2021. On 2.2.2021, for bot the ways Rs. 55 was collected for onward and return fare @ Paranur toll plaza, instead of Rs 35/- Given below are SMS details:

Toll charge (MEEBBA006LB748463) for Rs 55.00 debited on Apr 02. Reader time is 02/Apr/21 07:07:29 AM(Paranur). Bal is Rs 281.00 - Equitas Bank.

Toll charge (MEEBBA006LB748463) for Rs 55.00 debited on Apr 02. Reader time is 02/Apr/21 02:19:03 PM(Paranur). Bal is Rs 136.00 - Equitas Bank.

Whereas @ Athur toll gate return fare was collected asRs 30/- only.

Kindly do the needful.