One can dial 1033 from Mobile/Landline for the following FASTag issues:
In case of any of the above issues such as FASTag is not acceptable at the toll plaza, etc. you need to call on the FASTag toll-free number helpline 1033 and lodge the complaint in detail. They will resolve your issue as early as possible. NHAI (GoI) has set up 1033 call center for providing all road assistance to the highway users including FASTag as well.