Payment transaction

I recently changed to you from npower. I have paid in advance but notice my previous supplier has also taken a payment after. Should this have happened

Hi there @J4ck1e_ your old supplier shouldn’t be charging you for any time after we took over your electricity and gas, and if they did they should be refunding you that money. Have you had a final bill from them yet? If not, they will probably be refunding you that money once they produce the final bill (it can take a few weeks). If they have, I’d recommend getting in touch with them and making sure that they’ve cancelled your payments to them, sometimes these things can get lost in the system