Billing issue and poor service

Hi.Their sevirce is very poor ,i have been contacting them since July but they are still going around circles instead of assisting with my debit order that was supposed to be on the 25th of each month. They keep on saying that they have changed it ,but they are still debiting my account on the 1st.On July they said that they have escalated the case to Higher Level,but even now they is no respond from them.Now my connection has been disconnected, and they are saying i cannot do the payment arrangement as i have reached the limit. Some of they Agent disconnected the calls while not done talking to them. This are the reference numbers that were escalated from July July ***4 August ***366517 Today ***5 Even when i asked them to cancel the contract ,they do not want to,there are saying that they need to escalate the case also.