perhaps I should explain a few things. I've never been on Pay As You Go myself (except for my first mobile phone when I was too young to have a contract) but both myself and Blastoise186 have spent an extensive amount of time researching how it all works even though we're both on Pay Monthly contracts. To be clear, it is impossible for the meter to know who is feeding it
and it cannot tell that the debtor has moved out without external help. The best any supplier can do is disable debt collection, calculate the overpayments and issue a refund for the lost credit. Debt recovery against the previous customer will still continue in the background but the supplier will ensure the new customer isn't left out of pocket once validation checks have been completed - and the supplier is satisfied that the new customer is indeed unrelated to the debtor.
While a Smart Meter can have the debt wiped off and debt recovery modes disabled with a single SMETS Command, traditional meters require messages to be sent to them using the prepayment top-up device that's actively linked the meter, specifically the electric key or gas card. When the correct message is transferred to the meter, the debt is wiped off and all debt collection modes are disabled. The meter will also set a message onto the top-up device to confirm that debt recovery has stopped and provide details of what has been collected to date - and when. A further completed top-up flow will allow this to be sent back to the supplier and any refund due can then be calculated. But in the meantime, debt collection will have stopped and no further credit deducted.
You'll be surprised how often this situation occurs. Both myself and Blastoise have a well thought out process for dealing with users who encounter such an event and it's documented on his private Confluence instance that I have access to. We can't fix it ourselves, but we both know the process well. It comes as a result of several years of research and the fact that Blastoise talks with his supplier on a regular basis to learn more tips he can share with others.
On the bright side, glad to hear things are sorted for you now @TeKa
. If you need my advice again, please feel free to stop by.