We moved into a 2 bedroom flat that previously used Ecotricity in July 2023, and had to use Ecotricity for 20 days while waiting for the switch over. Bear in mind, this was the height of the summer so we didn't have heating on, nobody was in the flat during the day, and only one person was staying in the property for most of those 20 days. They sent us a bill for £120 based on estimates and inaccurate meter readings. I have checked this against the price for Out of Tariff Electricity at this time, and they were charging us the absolute maximum they could. I was able to get this down to £106, which is still £20 more than I pay for a full month of electricity with my current supplier. I then spent the next 2 months sending across meter readings, giving old meter readings to demonstrate previous usage, spending up to 30 minutes on hold. They kept fobbing me off, telling me I needed to speak to my current suppliers as only they could confirm the new meter readings. So I spent hours on the phone to them trying to get this sorted (they had never heard of this and were baffled why Ecotricity were sending me to them). In the meantime, I was getting sent emails and letters from a finance company telling me I now owed more money and they would be visiting my property - always lovely to receive in the middle of trying to get this sorted. When I emailed ecotricity to ask why I was receiving this, they said it was automatic and I should ignore them, yet they kept coming anyway. After nearly 6 months of back and forth on this, Ecotricity said they had seen the meter readings but had been unable to come to an agreement with my current supplier so would not be changing the bill. I've wasted so much time and energy on this, getting passed around to various departments, having to write down various facts and figures, needing to call up my current supplier and try and get them to help, I have rarely known such a difficult company to communicate with. 20 days of electricity has cost me £106 and literally months of emails and phone calls. Their hold music is quite good at least.