As for the cancelled line of "Web Billing," you will not receive "Seikyu gaku Oshirase email (billing amount notification email)" right after the cancellation.

If "Web Billing" has to be cancelled due to cancelling the line, the timing of the automatic cancellation is 480 days after the line cancellation.

But "Seikyu gaku Oshirase email" will be sent while there are charges for you to pay.