Infrastructure Development Finance Company [IDFC] — Fastag minimum balance

IDFC bank fastag forcing customer to keep minimum balance in the fastag account 150 Which is illegal asper NIHA and supreme court order . I had a balance of 90 RS when I reached the toll, toll charge was RS.50, but it didn't allowed due to minimum balance was not there. when i contacted customer care they are not giving proper support and even after recharge also I have waited 30 min to reflect in my account. please take action reg this.