One touch switch issue

Hello, the last day of my contract with Virgin media was 7 December 2025. On 6 November I chatted with an agent and stated I don't want to continue it. They asked me if I will confirm the cancellation myself on 7 December, or use the automatic service One touch switch. I said I would like to use the service, because I didn't want to forget and pay more. That was a big mistake. 

On 8 December EE installed their router and they used One touch switch to inform VM that I no longer use VM services. I was a little surprised I could still use VM router on 8 December, but I turned it off the same evening. Obviously I will pay for this one additional day of service. But not more than that.

I am sure VM can confirm I didn't use their services after that and not make me pay more.

On 19 December I chatted with another VM agent to confirm the cancellation had taken place. They said there was no notification that my contract is cancelled. I find this hard to believe, because EE even sent me a reference number as a proof that they used One touch switch to inform VM that I no longer use VM.

The second agent suggested to cancel the contract form 19 January, but I asked them to wait and not do that. I didn't want the situation to become even more complicated. The agent ignored me and canceled the contract from the same day (19 December), which meant I have to pay for a month and a half more than I used VM.

Now I am told to pay £150 as a closing bill. I don't agree with this and shouldn't be made to pay it.

VM resolution centre sent me some emails, stating they couldn't contact me for more information. This is impossible, because I reminded they 4 different ways they can reach me. Phone, email, post, VM app. They said I still need to pay so much money for only 1 day.

I have them the reference number to check with One touch switch, but they replied with the same email as before. They couldn't reach me and I have to pay £150.

All this is getting out of hand and I don't feel anyone is listening to me at all.

What can I do in this situation, because I am not paying the last bill? Only for my usage on 8 December.