I would like to know the method of payment available after cancellation
Even after cancellation, you will continue to be billed using the same method of payment as during your contract.
Usage fees for au for the month of cancellation will be billed in the following month.
Important notes
If your method of payment during the contract was by bill, make the payment using the bill sent to your billing address.
If your method of payment during the contract was direct debit from bank account or credit card, it will be debited from the specified bank account/credit card registered when you signed the contract.