To change from pre payment to a credit account you have to apply to customer services. If you are in a rented accommodation you also have to get the landlord's permission. It will probably involve a change of meter and a credit check, so it is quite a long process.
over a month ago i made a request to change from a prepayment meter to monthly direct debit, provided all of my deatils for the credit check and landlord permission and was told i would be notified by e-mail. It was a lenghty process and i have not heard anything back.
I have been trying to get a smart meter fitted , and pay by direct debit,I phoned customer services and arranged for
someone to change the meter last thursday 10/10/2019 but no one turned up I am not happy with the service very poor
I explained to the lady that the meter was faulty as for example if I put £20. in it regsted £50.