Cancelled but still billing

I cancelled everything on the 17th November and even got the confirmation email for the changes. 
On the 8th September when my new supplier went live I got an email from Virgin ‘thanks for making those changes’ - they removed the phone (thought it was an error as I already cancelled everything). 
I looked into it and they had actually reinstated my services. 
Can’t talk to anyone on the phone, they were still billing me for £71.22 so I cancelled the direct debit as I simply can’t afford to pay for something I’m not receiving. 
They explained on the phone I will have a final bill amount and then all done and complete. I paid the final bill but now I have an over due balance of £220! 

When I tried to call virgin they said I needed to speak to the moving team. The moving team kept asking when I’m moving house to which I explained I’m not moving I have already cancelled. They then put me through to cancellations. Cancellations said that because I have an over due amount they can’t help me and I need to speak to debt but debt said I need to speak with cancellations! 
Im going around in circles and this debt is impacting on my credit rating. 
They only phone me with an automated service to pay so I just can’t speak to anyone