I have when my supplier folded, Ofgen transferred me to EDF. They have emailed saying it's in hand, but the original direct debit is still going out and besides EDF saying I'm on the standard tariff there has been very little update. In fairness, the company's that folded were pretty big, and it's not a 5 minute job to transfer 1/2 a million plus accounts across. Luckily at least when it all settled down, we know that although the price is much higher than o was paying, there's nothing currently available any cheaper!