I left Spark in August. I was paying £111 a month for a one bed flat ( I live alone and use a normal amount of gas and electric) which I thought was extortionate so I left and found another company. Somehow I ended up with a £360 end of contract bill. I didn’t think this was correct and had it looked into. However I was assured by Spark this was correct. I could not afford to pay back this loan straight away so I set up a payment plan with a company called Opos Limited. I have made 2 payments which they have told me they have sent straight to Spark. However, every day for the last two months I have received an email AND a text daily asking for the money and a threat of my account being transferred to a debt collection agency. I have rang Spark on 4 occasions regarding this and have been told they will stop communication but this has still carried on. On the 26th October I received a text from another company AJJB law who have said Spark have handed this debt over to them and I need to pay today!!! This company have EXTORTIONATE charges for both gas and electric and can not communicate effectively with their customers or their partner companies. Do not use!