Best would be to send them a ticket informing them that all payment details against your account to be removed immediately. Once done you should be OK. In fact ask them to remove your details from the system and not to put you on the PAYG account unless you want to use it or the existing PN supplied email addy.
"One thing that these guys (other ISPs) all have in common is their complete inability in being able to manage a network,
which is something that we are totally transparent on and also do totally effectively." Marco Potesta (Director of Marketing, PN)
claimed.