With recent update they will be charging fees. Most likely for virtual debit card fee. if you have the app installed and not using then time to close it.
https://www.frimi.lk/faqs
closing the NTB account will have to go visit nearest branch. you can cancel the virtual card by calling frimi centre
https://www.frimi.lk/faqs
closing the NTB account will have to go visit nearest branch. you can cancel the virtual card by calling frimi centre