Late payment

A couple of weeks ago, I got a note from the phone company: “Please pay your past due amount or your keitai service will be terminated on 2/6.”
Huh? I checked with Tod, who is in charge of family bill payment, and he said he’d paid them all. The current bill didn’t show a past due amount, so I ignored the note.
My keitai was turned off on 2/6.
Of course it turns out there was an unpaid bill buried in Tod’s pile of papers. Oops. He paid it at the convenience store on the way to work today and less than 30 minutes later my phone was back on.
I expected a hassle involving a special trip to the NTT office in Shinjuku, a mandatory letter of apology for being a deadbeat, and a fee to turn the service back on followed by a week’s delay while they reactivated my account.
But this was as easy as it could be. Thank you, NTT DoCoMo. But next time, could you please put the past due amount on the future bills?