I did exactly the same when I realised Plusnet has not terminated my contract for broadband. It took 15 min to get through on the phone but the account department confirmed that the cancellation would be back dated and that I would not be charged.
From
https://www.plus.net/help/legal/cancellation-policy/
If you are moving the service to another provider you don't need to contact us and MAC (Migration Authorisation Code) keys are no longer required to move between providers.
Please note that upon receipt of notification from a new provider that you wish to transfer your service, we will contact you to let you know the consequences of moving your service, including any applicable early termination charges.
To ensure no loss of service, your account will only be closed when we receive confirmation from our network supplier that the service has moved to the new provider.
When we receive confirmation that the transfer to the new provider has completed, our systems will automatically close your account.
If you don't receive confirmation of your account's closure once the transfer to the new provider has completed, you're advised to call our Customer Options team to inform us that your transfer has completed.
Edited by spile (Sat 18-Jul-20 07:24:23)