SCUM of the earth, harass you into paying non-existent debts, after you left an energy company that owed you money, that subsequently went bust. Dishonest is an understatement. Don't be bullied into paying money you don't owe just to make them go away. That's what they do, they tell you the only way to get rid of them is to pay them. That's illegal, it's harassment. The law is clear.