They - their complaints department, their billing section and their customer 'service' department - are wholly and utterly useless. Their chatbot service is equally bad as is you don't fit exactly into the query box, their is a total lack of comprehension. There are more than twenty individual complaints and each time, the reply is; 'someone will get back to you in five working days'. Make that weeks, months or years - you will not get a reply, or if you get one, it will not be useful/addresses the issues/doesn't require you to prove something impossible to prove. I was asked to provide a gas reading - I don't have gas!