National Highways Authority Of India [NHAI] — Excess of Toll charge

Hi sir/Mada,

Today have been charged round trip toll charges which I was using single trip between Kovalam to Mahabalipuram (Mamallapuram). This was not first time for me. My car reg number TN11E9816. have been crossed at Kovalam around 17 hrs where I touched my single trip around 17: 35 hrs at Mahabalipuram. But I was charged round trip amount of 59.
Can you please investigate this issue and inform them to settle my remaining amount. Advance thanks for your actions in this regard.

Regards,
S. Sundar
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