In March/April 2015 I signed up with Flow Energy paying by monthly direct debit. When the fixed rate tariff ended I switched to nPower. Flow energy sent a final bill and I assumed the balance had been taken by direct debit and the account closed.
This month I returned to Flow as they had the cheapest tariff for me only to find that later this month I will be making my first payment on the new account, but also £138 which was owing on the earlier account from a year ago. Flow have never contacted me in the intervening year and I was unaware of anything owing. Flow were responsible for col