Been a customer for over 30 years, I've always paid quarterly but have had 5 bills since the end of November. I live alone in a small house with the usual household appliances nothing high energy usage,and I only heat the living room not the whole house. I paid £323 at the end of February and then received another one for£519 at the end of April. I have never paid this amount even in the middle of winter, and I knew after this I was being mugged , lucky I don't do direct debit. I have had 4 phone conversations without any success,tried online nothing,and sent 3 letters no replies.To top it all looked online this morning and they have stuck me with another £54for13 days usage bringing my total bill for 5 months to£1116 for 5 months. Avoid this company like the plague.