Poor management and cancellation debt busters

I am struggling for to get hold of them for more than a week to cancel my debt review. They dont manage my accounts. All is paid up now and they refuse to assist me telrphinically. They dont read my mails and dont reply via mail. Easy to start and after more than 5 years to cancel it you struggle to stop and cancel it. When you phone in they just tell you they will not assist you till they aknowledge your mail with a ticket number. Its 3 days now and still no reply at all. I will not recocomend anyone to use them. Easy to sign up, but cannot cancel even if all my debt is paid up now and yet they still dot reply to stop my debit orders or debt review