Good afternoon Behealey,
I guess you completed the moving out form now located within the APP's account section.
If it was me, by now I would of contacted PP direct, so proceed to the APP.
Open help and open ask wattBot, then type "Message the Team" and post your concerns.
Response back with the bot within 2 days from a PP team member.
Sorry if I've missed the point...you do know that when you move you will inherit the energy supply for that property before you can switch to another or PP.
Plus located in the FAQ's under payments there's a one off payment contsct link if that applies. Always retain meter reading images and records during times of change. Sorry I've waffled.
Revert back for more member feedback and return at anytime for more support.