Best answer by MrSmart
I signed up a couple of months ago but still paying old supplier. How long does switching take? How can you check you’re registered?
It sounds as though you have switched, although need to confirm that via the app. If you've given opening meter readings then you definitely will have done. That process takes about 20 days or so for the actual switch but it can take 6 weeks to receive a final bill from the old supplier so it's fairly common to pay 2 direct debits whilst the old supplier receives the reading and finalises their account.