Only with Shell energy for a short while paid £170 per month, after leaving I paid my final bill only to be sent another for a separate amount, I asked for them to provide a breakdown of that bill as I didn't believe I owed it, only to be sent another bill with no breakdown of charges, then I started receiving text stating that they will be taking further action, so I reluctantly paid the bill, only for them to say I haven't and continue with the threatening text. I rung customer service only to be put on hold for over an hour and cut off. Still unresolved, so annoying to spend hours on the phone with rude staff when I can prove I've paid my final bill. Poor customer service, don't go near this company!