For any query/complaint you call at 180030069090, 18004196606, 18602666888 or mail at fastag [dot] support [at] kotak [dot] com .
Level 2:
If your query is still not resolved or you face any issues or rude behavior at the toll plaza then you can call National Highway Helpline No. at 1033 or mail at etc [dot] nodal [at] ihmcl [dot] com .