Was in credit by £293.00 with electricity account held with british gas, Gas bill of £75.10, Instructed British Gas to pay the gas bill and credit the balance which they did, Received a letter threatening disconnection even though our online account shows gas bill at nil, Phoned them due to letter received and was assurd no more would be received, Now received a further letter threatening legal action and disconnection witihn 5 days plus over £300.00 extra charges, We have never not paid. does any one know of any action we can take to stop this.