Says Orange on the file i called up and cancelled which is ok according to the terms and conditions but because i had done this i thought no more of it

Hello guys please read. I need help on a matter with Orange that’s being going on for the last 2 years. I have tried CISAS but it’s been over 9 months so they cannot help I have tried civil legal advice, debt council , citizens advice etc and no one can help I get passed around with no actual information on what to do. I had a contract with Orange for 18 months and before it ended I cancelled the contract with Orange and thought that was the end of it, 3 months later I return home from university to find bills and debt letters requesting money for line rental when the contract had been cancelled. I tried to get this across to Orange who have no care for the matter and would not even deal with me, I have been battling debt collectors and Orange for over 2 years trying to explain the situation and have got nowhere with them and they have defaulted my credit file for 6 years saying I owe the money and that’s it. I have requested call recordings to prove my case which they will not provide and the phone had no usage over the 3 months as I had taken a new contract with a new provider. I need to get the matter resolved as I need to obtain a loan for my Masters at university and this is having a critical affect on my future and is also causing me a lot of stress and I certainly cannot afford to take them to court as I am student. Any advice on this would be of great help as I am at a loss with this situation right now

Hi guys newbie here just wondered where i post about a problem i am having with Orange i dont want to put a big essay on here if its wrong Thanks in advance Michael