Contract doesn’t want to be suspended

Honestly I don’t even know where to start,I can never get through to a call centre agent. I have been struggling to close my contract for a while now and what ****es me of the most is I’m getting billed monthly. I made a payment again in September because I got a message saying I was owing. I complained on twitter that I can’t get through to the retentions department aswell,I got a message saying my contract had been suspended but yet I’m still getting a message saying I’m owing. Please can someone call me and sort this out,I don’t want to keep paying for a contract that doesn’t exist anymore.