Hi all, I would appreciate some advice. I moved into a rented flat in Jan 2010 and lived there until I moved out in Sep 2012. Electricity was supplied by EDF, payment was by direct debit and I settled the final bill on 17th Sep 2012. EDF have now sent me a new bill for the period 27th Feb 2011 until the day I moved out with a completely different value to the my original bills (and with no explanation or covering letter). Having now spoken to them, they claim that I was billed for a single rate meter but in fact had an economy 7 meter (I honestly have no idea what sort of meter it was). The reading in the day rate section of the new bill matches my old bills but of course the night rate is brand new. While discussing the matter EDF flatly refused to accept that the error may have been their fault and even attempted to suggest that I had told them what sort of meter it was when I opened the contract (utter nonsense). When question about their meter reading agents not noticing for 33 months either they had no answer. Right now I'm waiting for them to come back to me but I have some questions: 1) Do they have a responsibility to provide me with any evidence that the meter was there while I lived there? Right now it's just a matter of trust, they could tell me anything and I wouldn't know if they were being truthful. Given their behavior on the phone I'm inclined to take what they say with a pinch of salt. How do I know they haven't just installed it and made a different error and billed me by mistake? 2) The entire bill is at different rates to my original bills, is this acceptable? I understand that if I consumed more electricity than I paid for then I'm liable (given question 1) but does that give them the right to apply a different rate to the electricity I did pay for and apply a different standing charge for the entire period? i.e. can they just switch my tariff? If so then what recourse do I have given the fact I based by choice of supplier on the price but now I'm being told to pay a different price with no ability to switch to a competitor. 3) The bill is dated 1st Mar 2013 and goes back to 27th Feb 2011. Doesn't the code of practice stipulate that they can't go back further than 12 months from the date of the bill? Does the fact I moved out have any relevance? Many thanks for your help. happy to clarify anything if needed.