Hello everyone. Back in June, I received a PCN from Indigo via ZZPS for allegedly parking without payment. In fact I paid but the machine did not register; I appealed and subsequenctly received a cancellation notice from Indigo. I have now received another notice from ZZPS claiming the penalty is unpaid and current balance is £170, and stating they will continue to persue the debt. Should I ignore this and just let them do what they want to do until it gets to court, get involved in correspondence with them, or what? I am inclined to send them a copy of the cancellation, tell them to sort themselves out and go away, but would appreceite advice from those more knowledgable than I. Many thanks.