Indian Railways — ir smart card and atvm

I am using ir smart card since 2016. Until recently it was helping me to get ticket in mumbai suburban train with dependability. Since few days the smart card started malfunctioning. No atvm is accepting the card, even though sufficient balance is there and the expirary date is 2019 feb. When i contacted the nearest card issuing counter they are not willing to solve the problems nor issue fresh card nor refund the amount after mandetary deductions. Instead they want me to approach the particular department at cst and resolve it. I am sure there are many commutators with similar smart card issues. Kindly provide mailing address of the railway authority for follow up in this regard. The problem giving card no. Is cr1404680.