Dhani Pay — Not cancelling my subscription

Dhani offered me to use their free card called Dhani Freedom Card which I have been using from last few months. I regularly clear my bills and I have no dues left to be paid now. I called Dhani today to close my card and they suddenly asked me to pay the subscription fee. I told them I don't want their services and that they had promised me free card then why this subscription service. The customer care said if you want to close the card you will have to atleast pay subscription fee once. If you don't pay it now it will keep getting added. I told them I haven't subscribed for any of their plans and services and I want to close their card but they are forcing me to pay atleast one time plan fees.I have already paid subscription fee for feb and mar month without even borrowing a single rupee from the app and i asked them immediately to cancel my subscription again they are calling this month and asking to pay the subscription fee.Please help me