FastWay Transmission — Fast tag refund

I sold my old Car and Buy new Car. I request to closure of old Fast tag and it's Closed but 1000 balance is still there when I talk to customer care for my refund then they told u have to buy new NHAI Fast tag...But when I went to toll plaza to buy new fast tag they told that now NHAI Fast tag is closed... They are not selling...and I told this to customer care..teh said you have to buy fast tag from Bharat petrol pump...but Bharat petrol pump refused that and said they are not selling tags...so unfortunately I have to buy ICICI Bank fast tag . Please resolve my issue and Refund my Rs.1000 ASAP