Hi Klipse
Thank you for your post and welcome to our community.
Once your services have been disconnected, our system will tot up any bills and credits that are left over, and give you a final bill. This is produced up to 30 days after your disconnection, which gives time for any changes you’ve made since your last bill to show on your account.
If it turns out you’ve got some credit on your account, we’ll pop that amount on a cheque and send it to you in the post.
It could take up to seven weeks for the cheque to arrive, so keep your eyes peeled for it.
There is more information here
If you have any further questions, please pop back to us and here and we would be happy to help.