User name for billing?

[#1]

I don't no my username to pay my bill

Moderator's note by Mike (Mav): Post moved to it's own thread.

[#2]

Not sure exactly what you mean. Are you paying a final, leaving bill? Or are you a new Plusnet user? Do you mean your Plusnet Username, to log on to your user account settings?

If you have received a billing email from PN it will be quoted in there.