There are various ways to pay your bill. You can find more information here: https://www.digi.com.my/support/postpaid/billing-information/pay-bill
For more information on paying via your bank account, please check out the following links:
Maybank2u https://www.youtube.com/watch?v=dKGAf9DIGI_POSTPAID_gv0
You can find more information on how to pay bills from your banking provider.