How to contact IDFC FIRST FASTag Customer Care Support? If you face any problem like a failed recharge, double deduction, or your tag not working, getting help is simple: FASTag Customer Care Helpline List of FASTag issuing banks and their helpline numbers. With IDFC FIRST Bank FASTag – FIRSTForward, make three payments like toll, fuel and parking instantly in a quick, queue-free and contactless manner. Apply for FIRSTForward FASTag now! You can buy a new FASTag by contacting the IDFC Bank FASTag customer care number given below. Contact number: 1800 266 9970 For a new registration or queries, you can write to IDFC FIRST Bank at [email protected].